Hello Mates,
Did any of you come cross a problem like all of a sudden smth blocking the transport connection from vphere client and vcenter server ? I tried to connect vcenter server via remote vsphere client and from inside of vcenter server. The same transport connection error message. After rebooting vcenter server, i am able to connect again. After 15 min, I am blocked again.
What I am done,
Windows Firewall is off.
No change on server ports.
Stopped IPSec service.
Nothing helped so far.
I disconnected all hosts from vcenter server and reconnected them again and it is solved...
I have discovered having User Account Control (UAC) enabled causes issues as well on Win2k8 Servers.
If you are running VDI (Citrix Provisioning) add the service accounts to the local security policy with "Log on as Service" permissions.