ESXi 6.7 on HP ProLiant DL380 G9 and Win10 Pro VM.

Physical serial port assigned to VM and works fine under control of a service. It is assigned to device /dev/char/serial/uart0.

Runs for days without a glitch.

If I restart the VM or the service to update a piece of code or a configuration, the serial port is not available anymore, no matter how many times I do resets.

To recover, I need to:

– inhibit the serial port in the VM’s Device Manager

– restart the service

– activate the serial port in the VM’s Device Manager

– restart the service again.

– then it works … until I need to restart the service another time …

Anyone has an idea what the cause may be … and, most importantly, what’s the solution?

Thanks