How to disconnect JUNOS TTY sessions with a TTY ID of "qX"

SUMMARY:

How to forcibly disconnect TTY sessions in JUNOS which got a TTY ID starting with either a q or an r or any following letter in the alphabet.

PROBLEM OR GOAL:

More than 32 TTY simultaneous sessions are opened to a router running a JUNOS version prior to 8.2.
As a result all the sessions beyond the 32^nd simultaneous session the TTY session ID will start with q .
The CLI command  request system logout terminal X  does not work for the TTY sessions whose ID begin with aq or an r  , and the session is not terminated.


Below there is an example:

• On the router there are many concurrent TTY sessions:  

operator@router> show system users no-resolve
11:24AM  up 10 mins, 40 users, load averages: 0.11, 0.10, 0.06
USER     TTY      FROM                              LOGIN@  IDLE WHAT
operator  p0       172.26.24.43                     11:20AM     - -cli (cli)
operator  p1       172.26.24.43                     11:22AM     2 -cli (cli)
[...]
operator  pv       172.26.24.43                     11:24AM     - -cli (cli)
operator  q0       172.26.24.43                     11:24AM     - -cli (cli)
operator  q1       172.26.24.43                     11:24AM     - -cli (cli)
[...] 

• Focusing on the first session starting with q (e.g. q0)

  operator@router> show system users no-resolve | match q0
  operator  q0       172.26.24.43                     11:24AM     - -cli (cli)

• We try to close this session by using the following command: 

  operator@router> request system logout terminal q0

• But the TTY session is still connected:

  operator@router> show system users no-resolve | match q0
  operator  q0       172.26.24.43                     11:24AM     - -cli (cli)

• A different (expected) result can be observed, when trying to disconnect a TTY session with TTY ID lower than qX, i.e.p1

  operator@router> show system users no-resolve | match p1
  operator  p1       172.26.24.43                     11:22AM     7 -cli (cli)

  operator@router> request system logout terminal p1
  
  operator@router> show system users no-resolve | match p1
  
  operator@router> 

  The TTY session p1 has been disconnected as expected.

SOLUTION:

Use the PID of a certain TTY session to disconnect it, as shown in the example below:

• Check which PID the TTY session q0 has: 
  

  operator@router> show system processes |match q0
3603  ??  Is     0:00.01 mgd: (mgd) (operator)/dev/ttyq0 (mgd) 
  

• Then specify the PID of q0 in the CLI command request system logout terminal: 
  

  operator@router> request system logout terminal q0 pid 3603 
  

• Verify, that the TTY session has been closed:
  

  operator@router> show system users no-resolve | match q0 

operator@router>

Note: This issue has been tracked via PR/80848.

PURPOSE:

Troubleshooting

RELATED LINKS: 
LINK TITLE:

JUNOS Problem Report PR/80848: [CLI] tty sessions not forcibly logged out if have ID "qXX" or "rXX"

LINK URL:  How to disconnect JUNOS TTY sessions with a TTY ID of "qX"