Resolving the Pseudo Terminal( pty) error Issue

To find the maximum number of pseudo-terminals (PTY) in IBM AIX:

# lsattr -l pty0 -E


To increase or decrease  the Pseudo Terminals

# smit pty

Type or select values in entry fields.
Press Enter AFTER making all desired changes.

                                                        [Entry Fields]
  STATE to be configured at boot time                     [available]
  Maximum number of Pseudo-Terminals                 [256]  --change this                                                                                                                    #
 Maximum number of BSD Pseudo-Terminals           [16]             


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Diagnosing the problem The symptoms may indicate that there is an application that is holding on to ptys and not releasing it.

1. Login to console .

2. Try using the 'fuser' command to find the culprit application, like this:
      # cd /dev/pts
      # fuser *
    The 'fuser' command will list all PIDs associated with each pty device.
    If there is a process that is not releasing its ptys, you will see its PID occur many times in the   fuser   output above .

3. Verify which process is holding the pty's  and inform the respective team for corrective action.