Summary

When clicking from the comments tab to history or all in the activity section of a JIRA issue you will see a 'Communications Breakdown' error. The development tools in Chrome show a 404.

Environment

(Optional - If Applicable)

• JIRA Cloud 7.0.OD-7
• JIRA Server 6.4.X and JIRA 7.x

Steps to Reproduce

1. Access https://ecosystem.atlassian.net/browse/ESS-64 without logging in.
2. Click the 'History' tab

OR

1. Install a fresh clean server instance
2. Create a new project and issue
3. Change the permission for the project to allow 'anyone' to browse project/administer project
4. Log out
5. Go to any of the issue from the new project
6. Click on the history/activity tab

Expected Results

Show the history/activity tab contents.

Actual Results

For JIRA 6.4.x
The UI throws a 'Communications Breakdown' error with the text

The JIRA server was contacted but has returned an error response. We are unsure of the result of this operation.
Close this dialog and press refresh in your browser

Development tools show a 404 error.

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For JIRA 7.x

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Notes

Logging in solves the problem. So it's something specific

Workaround

If you can log in you'll need to do that.