Hi Aishr
thank you for replying - I'm aware it's not supported it a temporary connection in order to use VC to run some PowerCli over the temporarily connected hosts. I Managed to fix the issue afterward.
I had to create a new VMK with the natted IPaddress as the interface IP ie 10.12..X. Xand stability improved.
"Failed to bind heartbeat socket for host address 10.12.X.X: Cannot assign requested address" error were eliminated