Simone, we are using mail gateway, and probably this started after we enabled mail gateway. I am wondering if this could be related to mail (due to "Post" in error message)? Can you provide some background what is this error supposed to mean?
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...