I'm configuring only IPAll in the Protocols for the two instances:

Instance2 (named instance):

TCP dynamic port 50851 (changes on restart)

TCP port 50851

Instance2 (MSSQLSERVER):

TCP dynamic port 50852

TCP port 50852

cannot start the service...

For all other IPn, I have blank for TCP and TCP dynamic port.

I also tried with 1433 and 1434. I'm stopping the named instance and try to start the default instance (MSSQLSERVER) but still cannot.

Let me know if you need some more info