Prime License Manager: Test Connection Failed with "Unknown Error"

[spamdemonium1]

CUCM version 11. Added product instance to Prime License Manager, but "Test Connection" fails with "Unknown Error".

This used to work until 1/8/2016. Installed licenses valid for another 3 months.

Have tried: license client reset registration

Also tried: license management reset user password

Also regenerated ipsec license based on some advice found in Support Community.

[Manish Gogna]

Can you try restarting the following service on cucm under Tools > Control Center > Network services and try again

Cisco ELM Client Service

Manish

[spamdemonium1]

I didn't retstart that , but I did reboot the whole CUCM several times. Also checked that NTP was running (based on a posting about a PLM problem).

Thought it might be bug CSCur95552, but that didn't work.

Also looked at logs in RTMT. The logs just said unknown error.