Telnet and ssh doesn't show the same limits when PAM limits.conf is empty.

Solution Verified - Updated -

Issue

  • When login through ssh or telnet, the limits are not the same (not limit is defined for the user test in limits.conf file):

    For telnet:

    [root@rhel610 ~]# telnet 127.0.0.1
    Trying 127.0.0.1...
    Connected to 127.0.0.1.
    Escape character is '^]'.
    Red Hat Enterprise Linux Server release 6.10 (Santiago)
    Kernel 2.6.32-754.el6.x86_64 on an x86_64
    rhel610 login: test
    Password:
    Last login: Fri Oct 18 15:28:06 from localhost
    [test@rhel610 ~]$
    [test@rhel610 ~]$ cat /etc/redhat-release
    Red Hat Enterprise Linux Server release 6.10 (Santiago)
    [test@rhel610-storage ~]$ ulimit -n
    4096
    

    For ssh:

    [root@rhel610 ~]# ssh test@127.0.0.1
    test@127.0.0.1's password:
    Last login: Fri Oct 18 15:27:07 2019 from localhost
    [test@rhel610-storage ~]$ cat /etc/redhat-release
    Red Hat Enterprise Linux Server release 6.10 (Santiago)
    [test@rhel610-storage ~]$ ulimit -n
    1024
    

Environment

  • Red Hat Enterprise Linux 6
  • sshd
  • telnet

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