If you see this error in your logs after attempting to add the JIRA integration, it's likely that you are using JIRA on-premise. The request from Aha! is going to a publicly routable IP but the response from JIRA is providing links to internal IP addresses. Since they are internal, Aha! cannot access them and the 302 error is being reported.
Please check the error log for any reference to the resource being located and you will likely see an internal (private) IP address.