Are there any firewalls in the way? Is the OpcEnum service running on the OPC server machine?
The OSIsoft DCOM configuration guide provides a lot of guidance. Getting OPC to work across a network can be a challenge at times.
2 of 2 people found this helpful
Is the client local or remote to the OPC Server?
Copying my answer from OPC DA Server can't access from another Machines
When listing the servers locally the OPC Client (same for the interface and OPC plugin in ICU), it simply browses the registry to find the key that indicates that the server is an OPC DA server. On the other hand, when connecting remotely, it leverages OPCEnum. With OPCEnum, PI software does not directly access the OPC Server registry key. We instead implement a COM interface exposed by OPCEnum and then invoke methods of that interface to communicate with OPCEnum; OPCEnum does the work and gets the OPC Servers for us.
Make sure that the OPCEnum service is running on both nodes - OPC Server and the node where you are running the PI OPC Client in the bottom screenshot.
After making sure that OPCEnum is running, you might be able to list the servers, but you will also need to make sure your DCOM configuration allows for the client to read the OPC Server. Consult DCOM configuration guide.