This error occurs when configuring a JDBC application to all servers in the cluster (a single server is normal, when the server is reported to be wrong by the remote server using the JDBC).
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weblogic.common.ResourceException: Could not create pool connection. The DBMS driver exception was: IO Error: The Network Adapter could not establish the connection
Not sure why you use the EM forum: WebLogic Server - JDBC might be a better fit.
Take a look at similar issues such as Errors with data-sources in WebLogic
Note that you might want to configure JDBC (DataSource) to be cluster-ware - see e.g. Using WebLogic JDBC/RMI and WebLogic Clustered JDBC