Ora-28575 unable to open RPC connection

 ORA-28575 unable to open RPC connection to external procedure agent

    Oracle Database Server Error Code Messages ORA-28575 About Help Description;

Unable to open RPC connection to external procedure agent.

    Error Problem Cause;

Initialization of a network connection to the external procedure agent did not succeed. This problem can be caused by network problems, incorrect listener configuration, or incorrect transfer code.

    How to Solve; ORA-28575 unable to open RPC connection to external procedure agent?

    Fix Action for Solve Ora-28575;

Check listener configuration in LISTENER.ORA and TNSNAMES.ORA, or check Oracle Names Server.