SSH tunnel stopped working after upgraded to RHEL 7 from RHEL 6

Solution In Progress - Updated -


  • Red Hat Enterprise Linux 7
  • OpenSSH


  • The Jump host system was recently upgraded from RHEL 6 to 7.
  • Post upgrade the SSH tunneling failed to work with the following error at destination server side.
Nov 12 08:59:27 server sshd[23200]: Accepted keyboard-interactive/pam for root from 192.1.1.XX port 52861 ssh2
Nov 12 08:59:27 server sshd[23200]: pam_unix(sshd:session): session opened for user root by (uid=0)
Nov 12 08:59:27 server sshd[23200]: error: connect to 192.2.1.XX port 22 failed: Permission denied


  • Enable the following SELinux boolean.
# setsebool -P nis_enabled 1
  • Now try to connect the SSHD server from the Jump host.

Root Cause

  • SELinux was preventing /usr/sbin/sshd from name_connect access on the tcp_socket port 22
time->Thu Nov 11 14:07:18 2021
type=PROCTITLE msg=audit(1636619838.178:370050): proctitle=737368643A207276656572616D
type=SOCKADDR msg=audit(1636619838.178:370050): saddr=020000160AD6023D0000000000000000
type=SYSCALL msg=audit(1636619838.178:370050): arch=c000003e syscall=42 success=no exit=-13 a0=9 a1=55e1518c0470 a2=10 a3=4 items=0 ppid=10719 pid=11709 auid=1647923307 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=680 comm="sshd" exe="/usr/sbin/sshd" subj=system_u:system_r:sshd_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1636619838.178:370050): avc:  denied  { name_connect } for  pid=11709 comm="sshd" dest=22 scontext=system_u:system_r:sshd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:ssh_port_t:s0 tclass=tcp_socket permissive=0

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