Can you login into the 3rd company with your Standard ID? We had some login issues until we hadn't validated user emails in all companies (Persons>>create menu>>check email address)
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...
