Customer can't add comment in Customer Portal for JIRA Service Management Cloud
Platform Notice: Cloud Only - This article only applies to Atlassian products on the cloud platform.
Summary
Problem
A customer is not able to add comments to the ticket that they have permission to view and add comments via Customer Portal. After adding a comment, the error is shown below on the screen:-
We couldn't submit your request. Refresh the page and try again

Diagnosis
Environment
JIRA Service Management Cloud
Diagnostic Steps
Logged in as the affected customer
Open the browser Developer Tools, depending on the browser, the steps may be different to access it, refer to this documentation for details.
Click the Network tab in the developer tools
Add a comment to the ticket
Search for comment requests in the developer tools, the request should show the
https://xxxx.atlassian.net/rest/servicedesk/1/servicedesk/customer/comment
POST request.The request status code 503 with Application Blocked response

Cause
This problem is caused by the customer environment setting. This usually happened in the organization's VPN security setting.
Solution
Workaround
Access a direct network connection, for example, a mobile data connection. Then, access the ticket and add the comment.
Resolution
The customer needs to reach out to the organization network or security support to resolve this.
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