Proxy error when viewing the Content Indexing page
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
Symptoms
The following appears in the IE browser when trying to access the indexing page from Confluence Admin >> Content Indexing:
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Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /admin/search-indexes.action.
Reason: Error reading from remote server
Apache/2.2.15 (CentOS) Server at confluence.com Port 80
Cause
This error message triggered when an SSL connection is configured from the browser to Apache, and Apache does a reverse proxy to your Tomcat server. Internet Explorer sends the wrong host information in an SSL connection and confuses Apache VirtualHosts.
In short, the server name presented is that of the reverse DNS resolution of the IP, not the one in the URL.
Workaround
There are three workarounds for this issue:
Remove the reverse proxy
Make a configuration where there's only one IP address per SSL virtual hosts/server name
1 server name == 1 IP address == 1 certificate == 1 Apache Virtual Host
Use a different browser
References:
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