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: Check to ensure that the BEQ driver is installed. If it is not, then the NSERROR code returned will be 12538 (NSENODRIVER). To fix this, reinstall Net8 and make sure that the BEQ driver is selected when it is 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 path name of the TNSLSNR executable as displayed by LSNRCTL is correct. 

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