Failed to register service principal name for Hyper-V Event 14050

Hi,

we have a domain with several Hyper-V hosts, clustered & standalone. All works fine. Now i have installed additonal Hyper-V host, which generates every 2 min. the event 14050:

Failed to register the service principal name 'Hyper-V Replica Service'.

Failed to register the service principal name 'Microsoft Virtual System Migration Service'.

Failed to register the service principal name 'Microsoft Virtual Console Service'.

No problem, take google and fix the problem.. no way..

The beavior is very strange, the errors also come up if the SPN's where manually added to the computer account.

Only one google hit after hours of searching says one guy has disabled the firewall and it works.

Now this is what i have done.. no change.. events coming up. So i stop the firewall service and it works!! The SPN's are successfuly registered! After the service is restarted, no more event 14050 coming up. After reboot same shit, events coming up again until the firewall servive is fully stopped and after successfully registering restarted.

But why?? Firewall rules are correctly implemented.

In summary:

Standart; does not register SPN

Firewall disabled; does not register SPN

Firewall service stopped; does register SPN successfuly

Anyone got a hint? Any help will be appreciate!!

Regards