When configuring your integration you may receive this error.
"Event ‘installed’ failed due to an unhandled error"
Your Jira server may not be accessible from the data center where Aha! is running. Aha! must be able to reach the Jira server to integrate with it. Your corporate firewall is likely blocking access.
To resolve this issue, follow the instructions in the whitelist the Aha! IP addresses document.