This is an odd one I’ve been battling for a few weeks. This system is running FPBX 15 so a bit older. I can go onto the UCP page enter my credentials and click login, however it comes up with a very generic error message.
All ports are opened correctly and I am just at a loss for next steps in troubleshooting this. The answer may be to upgrade to FPBX16 but that’ll be a little bit away.
We’ve seen this where a previous UCP deployment left an existing config that is no longer compatible with the latest UCP release. Here’s the fix that worked for us: BUG - UCP 16.0.38+ Bug | The VoIP-info Forum
