[NTLUG:Discuss] Strange iptables problem on CentOS 4.4

[Sally Welch]

On 2/19/07, Rusty Haddock <rusty at fe2o3.lonestar.org> wrote:
> steve wrote:
>     >Truly, telnet is the most dangerous 'protocol' left on the Internet.
>
>
> Sorry, telnet still has some uses albiet few but certainly not zero.
>
>         -Rusty-


It's been years since I've used telnet for a shell login, but I
frequently use telnet to diagnose problems.  If I am having difficulty
ssh'ing to a box, often telnetting to its port 22 will give me a clue.
 At least it will tell me if the server is answering that port.  I
also telnet to ports 80, 443, 25, etc to diagnose other problems.
Sending a test email by telnetting to port 25 is a handy email
diagnostic tool which will pinpoint exactly why the MTA isn't
accepting the email.

At work I have been known to telnet to port 3389 to diagnose Windows
terminal server problems, but I steadfastly refuse to actually login
and fix Windows problems...  ;)

Sally