An administrator is unable to connect to a server via VNC. Upon investigating the host firewall configuration, the administrator sees the following lines: - A INPUT -m state --state NEW -m tcp -p…

Changing DENY to ACCEPT on an existing line would only open a port already listed (3389, 22, or 80), none of which are the VNC port 5900.

VNC listens on TCP port 5900 by default, yet none of the listed iptables rules reference that port. Without an explicit ACCEPT rule, traffic to port 5900 is dropped by the default policy. Adding a rule such as '-A INPUT -m state --state NEW -m tcp -p tcp --dport 5900 -j ACCEPT' would permit incoming VNC connections.

Removing a line would eliminate an existing rule but would not create the missing ACCEPT entry for port 5900, so VNC traffic would still be blocked.

While DENY is not a standard iptables target (correct targets are DROP or REJECT), correcting that typo does not add any rule for port 5900 and would not restore VNC connectivity.