LSNRCTL> start
Starting /oracle/10g/bin/tnslsnr: please wait...

TNSLSNR for Solaris: Version 10.2.0.2.0 - Production
System parameter file is /oracle/10g/network/admin/listener.ora
Log messages written to /oracle/10g/network/log/listener.log
Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
TNS-12546: TNS:permission denied
 TNS-12560: TNS:protocol adapter error
  TNS-00516: Permission denied
   Solaris Error: 13: Permission denied

Listener failed to start. See the error message(s) above..