Issue Summary

When numerous projects and filters exist on the Jira side, users are encountering timeout errors when attempting to add Jira Agile Sprints to Confluence Team Calendars.

java.net.SocketTimeoutException: Read timed out 

Steps to Reproduce

1. Navigate to any space on Confluence that is linked to a Jira instance with a significant number of projects and filters.
2. Navigate to the Calendars section from the left sidebar.
3. Click on the Add Event button and select Jira Agile Sprints.

Expected Results

• It is expected that the Projects dropdown within the Add Event pop-up will be populated with the Jira Agile Sprints.

Actual Results

• If the user has access to multiple projects and filters are present on the Jira side, the Projects dropdown may not populate, resulting in a timeout error being observed.
• Inspecting browser's Developer Tools, we can see the below request is returning HTTP 500 Internal Server Error: 

   https://site.atlassian.net/wiki/rest/calendar-services/1.0/calendar/jira/<CalendarID>/query/options.json

Workaround:

Currently there is no known workaround for this behavior. A workaround will be added here when available