Yes, you are at the right starting point by looking network attributes, using the ‘CHGNETA’ command.
But also run ‘CFGTCP’ and check:
host table entries (option 10)
DNS entries (option 12)
TCP/IP applications (option 20) –> SMTP attributes (if you send mail)
Then, look at the relational database directory entry ‘WRKRDBDIRE’, to make sure this is correct.
Hope this helps you make a good start.