Web Reference: Jan 19, 2026 · The connection request could not be completed because either the database listener process was not running on the specified host and port, or an Interprocess Communication (IPC) protocol connection was attempted but there was no listener for the specified key running on the local machine. Mar 27, 2026 · Conclusion FAQs What ORA-12541 Really Means ORA-12541 is raised by Oracle Net when a client cannot establish a session with a database listener. Think of the listener as the doorkeeper to the database instance: it sits on a TCP (or TCPS) port, accepts connection handshakes, and directs clients to the right database service. Nov 13, 2012 · Action: Ensure that the supplied destination address matches one of the addresses used by the listener - compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on the remote machine.
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