Change of Certificates in Webinterface- bricked system

Always when I change the certificate in the web interface and reboot, I am stuck with a bricked system:

Unhandled Exception

“Unable to validate Signature”

See attached screenshot. I consider this a bug.

Best regards,


Can you describe in detail (or point to the part of the documentation) which steps are taken to change the certificate?

Best Regards,

Hi Dirk,

I go to “System/Certificate settings”, change the following:
CN from “Univention Corporate Server Root CA (ID=uj2OBl27)” to " Corporate Server Root CA (ID=uj2OBl27)"
Email Address from to
Location Settings from Germany to Austria
(State and Location are detected properly to AT)
Business Unit from “Univention Corporate Server” to “IT”

Then I save and popup says its restarting services.

After that, the installation is bricked, eg. I can see the main webpage, but can not longer logon to the Admin-Page.
Service restart on the console is working.




I am not able to reproduce this. My steps:

  • using Firefox (version 42) logged on to my test-system with https and IP-address (local virtualized system, not included in any existing DNS)
    Certificate was already accepted earlier as trusted
  • using the “Certificate settings” UMC Module I changed all available fields in a comparable way, the certificate was generated
  • rebooted the system, when accessing ucs-overview with https the new certificate was presented, login was possible

It might as well be related to the Browser and its certificate handling.

Best Regards,

This interesting,

this happens with a clean UCS VMWare Image, cleanly downloaded and setup only with the gui.

So this should be reproducable with the original UCS Vmware image, though.

Best regards,