SEP Manager will not start when SEPM API Service is started

Hello,

I have upgrade my test server. I did not have issue during upgrade, all steps was the same like in previous upgrades. Unfortunately, after upgrade I found an issue. My Manager cannot open GUI when 'Symantec Enpoint Protection Manager API Service" is started. When I stop this service GUI open as expected. I can see in task manager that processes are running but guii wont open : 

When I stop this service , manager GUI open corectly:

Someone can explain me why this issue happen?