Solution to Oracle 11g listening program failure to start case

When I started the Oracle service today, I found that listener was unavailable.

Use lsnrctl

LSNRCTL> start

Start tnslsnr: Please wait...

TNSLSNR for 32-bit Windows: Version 11.1.0.6.0-Production

The system parameter file is d: \ app \ qiao \ product \ 11.1.0 \ db_1 \ network \ admin \ listener. ora.

Write the log information of d: \ app \ qiao \ diag \ tnslsnr \ qiao \ listener \ alert \ log. xml

Error listening to this object: (ADDRESS = (PROTOCOL = tcp) (HOST = 127.0.0.1) (PARTIAL = yes) (QUEUESIZE = 1 ))

No listening: (DESCRIPTION = (ADDRESS = (PROTOCOL = ipc) (PIPENAME = \. \ pipe \ EXTPROC1521ipc )))

TNS-12560: TNS: protocol adapter error.

TNS-00583: valid node check: unable to perform syntax analysis on configuration parameters

The listener failed to start. See the error message above...

Does listener. ora fail to be parsed?

---- No. This file has not been changed recently!

Oh, I changed d: \ app \ qiao \ product \ 11.1.0 \ db_1 \ network \ admin \ sqlnet. ora the day before yesterday.

Is it caused by it?

This is whether you have changed your sqlnet. ora file, which may cause the listener to fail to open and report the above error.

Note: This is only one case!