Just some info I found about changing domains. Our company was recently purchased and we switched everyone to the new company's domain. The new company used a different ip range. For Syspro client and server to continue to communicate you need to do the following.
On the Server:
Run CCINST.EXE (SYSPRO61\BASE) and change to the new ip.
In the SQL configuration you need to change the to the new ip
In the ODBC/DSN change the ip for the SysproServer
On the Client:
Right click the Syspro icon and change the HOST ip address to the new one.
Hope this helps.
DM