the PI OPC DA Interface connects to the OPC Server via hostname, or IP address. This is specified in the interface instances .bat file with the /SERVER= parameter. This .bat file's default location is %pihome%Interfaces\OPCInt.
To ensure connectivity, over TCP/IP, please make sure the OPC Server machine can be pinged from the interface node, using the same connection string specified after \server= in the .bat file.
Also ensure that the firewalls are configured for allowing DCOM security.
The connection string in the .bat file must resolve to the OPC Server machine.
Both OPC server & interface node are on the same machine. The new IP address can ping to PI archive, so I would think it can work after IP address changes.
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