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Originally Posted by jaomedes
Dear experts,
How can I block Telnet Access to a Linux Box.
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Just don't run a telnet daemon on that box.
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Is there a possibility of blocking telnet depending on the source IP Address?
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You should be able to do that with /etc/hosts.deny and /etc/hosts.allow. But in the first place I would recommend to use SSH instead of telnet. telnet is obsolete and insecure.