ORA-3136: WARNING Inbound Connection Timed Out

The default value for Oracle Net parameter SQLNET.INBOUND_CONNECT_TIMEOUT under SQLNET.ORA file is 60 seconds.

If any client fails to provide credentials or for any reason cannot complete the authentication process in 60 seconds or less, this error will be thrown in the alert.log.

And possible reasons for the error can be:

• The DB server is heavily loaded and cannot finish the client logon within the time specified.
• The server receives a valid client connection request but the client takes a long time to authenticate more than the default 60 seconds.
• A client or application is attempting to connect using the wrong userid or password