Tunneled ssh session not working with iptables rule to reject all other input traffic other than the required one

Solution Verified - Updated -

Issue

  • I am accessing vnc over tunneled ssh session using below document

How to connect securely to VNC via tunnel over SSH ?

  • I have configured iptables rule to DROP all the connections after allowing required traffic

    cat /etc/sysconfig/iptables
    ...
    rules to allow required INPUT packets
    ...
    -A INPUT -j DROP
    ...

  • VNC over ssh tunnel is accessed on localhost, still I am not able to connect it when DROP ALL rule is in place.

Environment

  • Red Hat enterprise Linux (All versions)
  • vnc over ssh tunnel

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