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what is the good way against reverse telnet?

Subject: what is the good way against reverse telnet?
Date: Mon, 31 Jan 2005 01:54:15 +0000
Hello, all.

I have operated firewalled linux webhosting server.
But only input traffic is secured and outbound traffic is totally opened by firewall.


So some attacker attacked these servers using reverse telnet.
So is there any method in order to protect against reverse telnet?
Any method or solutions without prohibitting outbound traffic?

Thanks in advance.

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