e0009541 - Could not connect to the vCenter server or ESX server. Please verify the credential supplied for login.

Hello,

Need help with this error:

e0009541 - Could not connect to the vCenter server or ESX server. Please verify the credential supplied for login.
 

Backup is failling for just 1 win 2003 vm, over 50 other vm's with same account are working fine

-I have tried backing up directly from ESX server using root account, but fails with same error in just 1 sec.

-I have tried backing up ESX ip adress and no help

-rebooted VM

-updated  BE 2012 to latest updates and remote agent on VM

-tried non GRT backup

Thanks in advance