Fix 'Connection failure, please try again' error when adding Bitbucket Data Center to Jenkins Bitbucket server integration plugin.

Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.

Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.

*Except Fisheye and Crucible

Summary

While adding a Bitbucket instance in the Bitbucket server integration plugin from Dashboard > Manage Jenkins > System, an error Connection failure, please try again appears.

Environment:

Bitbucket Data Center 8.9.6 but may be applicable to other versions.
Bitbucket Server Integration plugin version: 4.0.0

Diagnosis

Please refer to Adding an additional logger for troubleshooting the Atlassian Bitbucket Integration plugin KB article for more details on enabling and disabling the debug logs for the Atlassian Bitbucket Integration plugin in Jenkins.

After enabling the debug logs in Jenkins, the following error appears in the console.

Jun 17, 2024 1:12:18 PM FINE com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl
Bitbucket - io exception
javax.net.ssl.SSLPeerUnverifiedException: Hostname bitbucket.example.com not verified:
    certificate: sha256/vKRDT3lPHqtrgcAQ9R9GowlfF6oowAurSHFK5tgkWP0=
    DN: EMAILADDRESS=user1@example.com, CN=bitbucket.example.com, OU=example, O=example, L=DL, ST=DL, C=IN
    subjectAltNames: []
	at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:350)
	at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:300)
	at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:185)
	at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.java:224)
...

Jun 17, 2024 1:12:18 PM FINE com.atlassian.bitbucket.jenkins.internal.config.BitbucketServerConfiguration$DescriptorImpl
Failed to connect to Bitbucket server
javax.net.ssl.SSLPeerUnverifiedException: Hostname bitbucket.example.com not verified:
    certificate: sha256/vKRDT3lPHqtrgcAQ9R9GowlfF6oowAurSHFK5tgkWP0=
    DN: EMAILADDRESS=user1@example.com, CN=bitbucket.example.com, OU=example, O=example, L=DL, ST=DL, C=IN
    subjectAltNames: []
	at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:350)
	at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:300)
	at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:185)
	at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.java:224)
	at okhttp3.internal.connection.ExchangeFinder.findHealthyConnection(ExchangeFinder.java:107)
	at okhttp3.internal.connection.ExchangeFinder.find(ExchangeFinder.java:87)
	at okhttp3.internal.connection.Transmitter.newExchange(Transmitter.java:169)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:41)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
...
	at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.makeRequest(HttpRequestExecutorImpl.java:86)
Caused: com.atlassian.bitbucket.jenkins.internal.client.exception.BitbucketClientException: - response: -1 with body: 'null'
	at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.makeRequest(HttpRequestExecutorImpl.java:101)
	at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.performRequest(HttpRequestExecutorImpl.java:160)
	at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeRequest(HttpRequestExecutorImpl.java:81)
	at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeGet(HttpRequestExecutorImpl.java:52)
...

Full stack trace

Jun 17, 2024 1:12:18 PM FINE com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl
Bitbucket - io exception
javax.net.ssl.SSLPeerUnverifiedException: Hostname bitbucket.example.com not verified:
    certificate: sha256/vKRDT3lPHqtrgcAQ9R9GowlfF6oowAurSHFK5tgkWP0=
    DN: EMAILADDRESS=user1@example.com, CN=bitbucket.example.com, OU=example, O=example, L=DL, ST=DL, C=IN
    subjectAltNames: []
    at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:350)
    at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:300)
    at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:185)
    at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.java:224)
    at okhttp3.internal.connection.ExchangeFinder.findHealthyConnection(ExchangeFinder.java:107)
    at okhttp3.internal.connection.ExchangeFinder.find(ExchangeFinder.java:87)
    at okhttp3.internal.connection.Transmitter.newExchange(Transmitter.java:169)
    at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:41)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:88)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl$UserAgentInterceptor.intercept(HttpRequestExecutorImpl.java:215)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:221)
    at okhttp3.RealCall.execute(RealCall.java:81)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.makeRequest(HttpRequestExecutorImpl.java:86)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.performRequest(HttpRequestExecutorImpl.java:160)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeRequest(HttpRequestExecutorImpl.java:81)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeGet(HttpRequestExecutorImpl.java:52)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketRequestExecutor.makeGetRequest(BitbucketRequestExecutor.java:185)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketRequestExecutor.makeGetRequest(BitbucketRequestExecutor.java:107)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketAuthenticatedUserClientImpl.getAuthenticatedUser(BitbucketAuthenticatedUserClientImpl.java:28)
    at com.atlassian.bitbucket.jenkins.internal.config.BitbucketServerConfiguration$DescriptorImpl.doTestConnection(BitbucketServerConfiguration.java:303)
    at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(Unknown Source)
    at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
    at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
    at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)
    at org.kohsuke.stapler.SelectionInterceptedFunction$Adapter.invoke(SelectionInterceptedFunction.java:36)
    at org.kohsuke.stapler.verb.HttpVerbInterceptor.invoke(HttpVerbInterceptor.java:48)
    at org.kohsuke.stapler.SelectionInterceptedFunction.bindAndInvoke(SelectionInterceptedFunction.java:26)
    at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
    at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:558)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:289)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:836)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:475)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:698)
    at org.kohsuke.stapler.Stapler.service(Stapler.java:248)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
    at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:163)
    at com.atlassian.bitbucket.jenkins.internal.applink.oauth.serviceprovider.auth.OAuth1aRequestFilter.doFilter(OAuth1aRequestFilter.java:91)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at jenkins.util.HttpServletFilter$1.doFilter(HttpServletFilter.java:76)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:166)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at jenkins.ErrorAttributeFilter.doFilter(ErrorAttributeFilter.java:29)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:154)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:94)
    at jenkins.security.AcegiSecurityExceptionFilter.doFilter(AcegiSecurityExceptionFilter.java:52)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:54)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:110)
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:97)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:63)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:111)
    at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:172)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:53)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:86)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:38)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:569)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
    at org.eclipse.jetty.server.Server.handle(Server.java:563)
    at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
    at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
    at java.base/java.lang.Thread.run(Unknown Source)
 
Jun 17, 2024 1:12:18 PM FINE com.atlassian.bitbucket.jenkins.internal.config.BitbucketServerConfiguration$DescriptorImpl
Failed to connect to Bitbucket server
javax.net.ssl.SSLPeerUnverifiedException: Hostname bitbucket.example.com not verified:
    certificate: sha256/vKRDT3lPHqtrgcAQ9R9GowlfF6oowAurSHFK5tgkWP0=
    DN: EMAILADDRESS=user1@example.com, CN=bitbucket.example.com, OU=example, O=example, L=DL, ST=DL, C=IN
    subjectAltNames: []
    at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:350)
    at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:300)
    at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:185)
    at okhttp3.internal.connection.ExchangeFinder.findConnection(ExchangeFinder.java:224)
    at okhttp3.internal.connection.ExchangeFinder.findHealthyConnection(ExchangeFinder.java:107)
    at okhttp3.internal.connection.ExchangeFinder.find(ExchangeFinder.java:87)
    at okhttp3.internal.connection.Transmitter.newExchange(Transmitter.java:169)
    at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:41)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:88)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl$UserAgentInterceptor.intercept(HttpRequestExecutorImpl.java:215)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:142)
    at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:117)
    at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:221)
    at okhttp3.RealCall.execute(RealCall.java:81)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.makeRequest(HttpRequestExecutorImpl.java:86)
Caused: com.atlassian.bitbucket.jenkins.internal.client.exception.BitbucketClientException: - response: -1 with body: 'null'
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.makeRequest(HttpRequestExecutorImpl.java:101)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.performRequest(HttpRequestExecutorImpl.java:160)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeRequest(HttpRequestExecutorImpl.java:81)
    at com.atlassian.bitbucket.jenkins.internal.http.HttpRequestExecutorImpl.executeGet(HttpRequestExecutorImpl.java:52)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketRequestExecutor.makeGetRequest(BitbucketRequestExecutor.java:185)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketRequestExecutor.makeGetRequest(BitbucketRequestExecutor.java:107)
    at com.atlassian.bitbucket.jenkins.internal.client.BitbucketAuthenticatedUserClientImpl.getAuthenticatedUser(BitbucketAuthenticatedUserClientImpl.java:28)
    at com.atlassian.bitbucket.jenkins.internal.config.BitbucketServerConfiguration$DescriptorImpl.doTestConnection(BitbucketServerConfiguration.java:303)
    at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(Unknown Source)
    at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
    at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
    at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)
    at org.kohsuke.stapler.SelectionInterceptedFunction$Adapter.invoke(SelectionInterceptedFunction.java:36)
    at org.kohsuke.stapler.verb.HttpVerbInterceptor.invoke(HttpVerbInterceptor.java:48)
    at org.kohsuke.stapler.SelectionInterceptedFunction.bindAndInvoke(SelectionInterceptedFunction.java:26)
    at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
    at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:558)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:289)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:836)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:475)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:698)
    at org.kohsuke.stapler.Stapler.service(Stapler.java:248)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
    at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:163)
    at com.atlassian.bitbucket.jenkins.internal.applink.oauth.serviceprovider.auth.OAuth1aRequestFilter.doFilter(OAuth1aRequestFilter.java:91)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at jenkins.util.HttpServletFilter$1.doFilter(HttpServletFilter.java:76)
    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
    at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:166)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at jenkins.ErrorAttributeFilter.doFilter(ErrorAttributeFilter.java:29)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:154)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:94)
    at jenkins.security.AcegiSecurityExceptionFilter.doFilter(AcegiSecurityExceptionFilter.java:52)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:54)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:110)
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:97)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:63)
    at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
    at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:111)
    at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:172)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:53)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:86)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:38)
    at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
    at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:569)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1580)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1553)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
    at org.eclipse.jetty.server.Server.handle(Server.java:563)
    at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
    at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:287)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
    at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
    at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
    at java.base/java.lang.Thread.run(Unknown Source)

Cause

The Atlassian Bitbucket Integration plugin 4.0.0 uses okhttp(version 3.14.9) as its HTTP client, and as highlighted in the release notes of okhttp, since the release of okhttp 3.10.0, CN can no longer be used for hostname validation. This behavior was deprecated with RFC 2818 in May 2000 and was recently dropped from major web browsers. Since CN can't be used for hostname validation, the certificate must contain the matching SAN in it.
The hostname in this case couldn't be verified since the Bitbucket certificate did not have the SAN (Subject Alternative Name). As a result, the plugin returned the "javax.net.ssl.SSLPeerUnverifiedException: Hostname <hostname> not verified:" error.

Solution

Reconfigure the SSL certificate deployed at the Bitbucket(or Proxy/LB) to include the SAN in it. If the certificate is self-signed, it will need to be imported into the Java trust store of Jenkins as an extra step.

Updated on March 14, 2025

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