Database Error Messages

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Updated
Jun 24, 2024

TNS-01100

TNS returned error number when attempting to start the listener

Cause

The bequeath (BEQ) mechanism that LSNRCTL uses to start the listener failed.


Action

If NS error code 12538 is also returned then the BEQ driver is not installed; call Oracle Worldwide Support as the BEQ driver should always be installed. If this is not the problem then the error is probably caused by the fact that the TNSLSNR executable cannot be found in the place expected in your platform's ORACLE environment. Verify that the full pathname of the TNSLSNR executable as displayed by LSNRCTL is correct.