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Home > Forums > MIS/IT > Security Solutions > Cisco Systems: ASA Series Forum

Block all telnet connectionsHelpful Member! 

thread1598-1688933
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RonSwift (MIS)
23 Jul 12 9:41
I am using only SSH to connect to my ASA 5520. I want to block telnet all together. What might be the best way to do this?

Thanks in advance
unclerico (IS/IT--Management)
24 Jul 12 2:53
you want to block telnet to the 5520 or through the 5520??

RonSwift (MIS)
24 Jul 12 8:12
Block all telnet connections to the 5520
Helpful Member!  ADB100 (TechnicalUser)
24 Jul 12 12:00
From the CLI check what telnet connections are allowed:

CODE

show run telnet
It should show something like:

CODE

telnet 192.168.1.0 255.255.255.0 inside
or maybe several lines.
The syntax is 'Protocol' (i.e. Telnet, SSH or HTTP), 'network address' (i.e. 192.168.1.0), 'subnet mask' (i.e. 255.255.255.0 to indicate all hosts on network 192.168.1.0/24) and finally 'Interface name' (i.e. Inside, Outside etc). Simply remove these lines to disable the access.

For example if you have 'telnet 192.168.1.0 255.255.255.0 inside' and you want to disable this just do a 'no' for the line.

Andy
RonSwift (MIS)
24 Jul 12 12:39
Perfect. Thanks
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