https://www.theeggeadventure.com/wikimedia/index.php?action=history&feed=atom&title=Testing_firewall_rules_with_netcatTesting firewall rules with netcat - Revision history2026-05-13T10:29:14ZRevision history for this page on the wikiMediaWiki 1.46.0-betahttps://www.theeggeadventure.com/wikimedia/index.php?title=Testing_firewall_rules_with_netcat&diff=2055&oldid=prevEgge: New page: It's quite easy to test to see if a firewall will allow traffic on a specific port if you have control of the server behind the firewall. Example: On the remote side, listen to a port: <...2008-12-12T03:03:20Z<p>New page: It's quite easy to test to see if a firewall will allow traffic on a specific port if you have control of the server behind the firewall. Example: On the remote side, listen to a port: <...</p>
<p><b>New page</b></p><div>It's quite easy to test to see if a firewall will allow traffic on a specific port if you have control of the server behind the firewall. Example:<br />
<br />
On the remote side, listen to a port:<br />
<geshi lang="bash"><br />
echo 'OMG!' | nc -l -p 5152<br />
</geshi><br />
<br />
On the local side, use telnet or nc to connect to the remote.<br />
<br />
<geshi lang="bash"><br />
telnet remote 5152<br />
Trying 10.136.2.242...<br />
Connected to remote.<br />
Escape character is '^]'.<br />
OMG!<br />
</geshi><br />
<br />
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