Steps to Reproduce:

1. Add JIRA URL in Gadget Feed (Confluence Admin > External Gadget > Gadget Feeds Tab).
2. Insert Agile Sprint Health Gadget into my Confluence page.
3. Approve authentication at first time and it works.
4. Refresh page multiple times

Expected Results:

Sprint Health Gadget should work

Actual Results:

Confluence constantly requests "Login And Approve" when the page refreshed.

Workaround:

1. Remove the Gadget Feed
2. Add individual gadget URLs (eg Agile Sprint Health Gadget) in Gadget Specification (Confluence Admin > External Gadget > Gadget Specification Tab).
3. Insert individual gadgets into the Confluence page and approve authentication

Fix

1. It seems that upgrading JIRA to version 7 fixes the bug with the Agile Gadgets.