There must be some minor mistake.
From your description, I assume that your Metadata Adapter is a remote one.
To see what happens in more detail, please increase the Server log in the following way:
- set the "LightstreamerLogger.pump.messages" logger at DEBUG level;
- set the "com.lightstreamer.adapters.remote" logger at DEBUG level.
Then restart the Server and show us the log from the restart to the error replication.
If the log confirms that the Adapter invoked is the expected one, then we can focus on the Remote Adapter side.