Application link from Jira 6 to Jira 5 fails

[Erik Husby]

I've updated one of our Jiras to Jira 6. Prior to the upgrade we had application links between 2 Jiras that was working fine. After the upgrade, attempting to create a link from the Jira6 to the Jira5 instance fails. But we can create the link (and a reciprocal link) staring from the Jira5 instance.

I've got both Trusted and OAuth access setup on both sides.

When I try to create the link I receive the message:

Unable to create a link to LabOps JIRA as the application does not have any authentication configured.

[Chung Park Chan · Accepted solution]

I see that you are using https. Perhaps you can try out the suggested solution in this KB:

https://confluence.atlassian.com/display/JIRAKB/Application+Link+authentication+fails+due+to+bad+URL+signature

[Erik Husby]

Thanks for the pointer.

Fixed the base url on both Jiras. Deleted the old links and recreated them starting from the Jira 5 system. Now works.