z/OS Communications Server
I can’t establish a Telnet connection 


Was message EZZ6034I displayed on the console or in joblog ?   If so, please skip to the next paragraph.
If not,  we need to determine if the connection request reach this host.  Please go here
      
Enable the TELNET DEBUG DETAIL function to receive additional diagnostic message EZZ6035I.  There will
be a Return Code within the text of the EZZ6035I message.  For a complete list of  return codes and a
description of each code , please refer to manual:

Title: z/OS VnRn CS: IP Messages Volume 4 (EZZ-SNM)
Document Number: SC31-8786-04


Some of the more common failures are described below.  Please select the hexadecimal return code from error
message EZZ6035I:

  x’3001’  RC_LU_INUSE
  x’3002’  RC_LU_INACTIVE
  x’3003’  RC_LU_ALL_IN_USE
  x’3004’  RC_LU_NO_MATCH
  x’3012’  RC_APPL_INVLD