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Unravelling an old IP block

vegaswiz asked
Last Modified: 2010-04-22
A new client/user is attempting to telnet to an open port (has account and permissions) on our box. We have a special program (telnet chess server) which uses the telnet protocol, but gives no shell access. Just client services. The client get's absolutely no response, or even a hint that there even is a telnet connection possible.

On the other hand, using telnet to port 80 (httpd) gets all the proper responses.

Attempting ssh to the box (no account, we don't let him in) gets the proper password challenge.

Any suggestions on where to look on our box? What to look for?

We are running the slackware distro, and there doesn't appear to be the usual /etc/rc.d/init.d/iptables to look in.

This same new client/user, can access our telnet protocol program from other IP addresses on the internet with no problem, which leads me to believe there is an old block somewhere on the box.

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