Connection Problems after Upgrade vom ABR 10 to 11

Hi

Last week we updated our ABR from 10 to 11 and since then a lot of problems are causing us some headache!

After upgrading some of the linux agents to version 11.0.17318-1 some of the servers are offline in the acronis management server. A few of them are fine, but most of them I can't get them back online.

Then I thought I'd just remove them from the AMS and reconnect them. Now that's not possible at all anymore, failing with the following error:

Code: 18'087'938(0x1140002)
LineInfo: 0x8FEADEA9B9A8837;

Module: C:\Program Files (x86)\Acronis\BackupAndRecoveryConsole\ManagementConsole.exe
Message: Failed to get information about remote machine 'linux-host.fqdn'.

Code: 18'087'938(0x1140002)
LineInfo: 0x8FEADEA9B9A8850;

Message: Failed to get information about remote machine 'linux-host.fqdn'.

Code: 18'087'941(0x1140005)
LineInfo: 0xAC0572B83EE95C36;

Message: Failed to connect to the service.

Code: 4'522'038(0x450036)
LineInfo: 0x3215ACDA31D72F6A;

Message: Failed to create managed entity 'machine'.

Code: 4'521'989(0x450005)
LineInfo: 0x279DD1D7639F7555;

Message: Connection to 'linux-host.fqdn' is broken.

Code: 65'520(0xFFF0)
LineInfo: 0xBD28FDBD64EDB8BC;

Message: The network path was not found

The Hostname is correct, IP is correct, credentials are correct!
What now?!