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Close TCP Port 23 - Telnet 3COM 5500-EI

CarolMM
Occasional Advisor

Close TCP Port 23 - Telnet 3COM 5500-EI

Hi, 

I would like to know how to close TCP port 23.

When I use nmap it is open.  Is there any way to close it in 3com 5500-EI?

Can anyone please help?

Thank you very much. 

 

 

14 REPLIES
parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

What's about trying with the telnet server disable command?

CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Thank you very much for your answer. 

It didn´t work.  Or, I didn´t know how to do it. 

When I tried it :

<5500-EI>system-view

[5500-EI]telnet server disable
^
% Unrecognized command found at '^' position.

Is there any other way?

 

Thank you very much.

parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Strange.

Which options the telnet server command have? check with Tab after writing telnet server at prompt once in system-view mode.
CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Hi, 

Not many options with tab in system-view:

telnet 

telnet-server

 

parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Well...telnet command (as for telnet server command plus its options) and telnet-server command have different syntax. Isn't?
Highlighted
CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Hi, 

With tab didn´t gave more options, but in the user manual there is a few:

telnet 

telnet ipv6

telnet source-interface

telnet source-ip

telnet-server source-interface

telnet-server source-ip

 

Thank you very much, 

 

parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

At this point I wonder if we're speaking about the same matter...so, could you provide sanitized (no S/N or private references) outputs of:

  • display version (and eventually also display device manuinfo)
  • display current-configuration

commands?

Thanks.

CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Hi, 

SuperStack 4 Switch 5500-EI 52-Port Software Version 3Com OS V3.02.03s56

 

Is this enough?

I would like to close listening port TCP 23 Telnet.

Thank you very much. 

parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Gosh, it's a Comware V3...

FalconSez
Occasional Collector

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Try:

undo telnet server enable
--
Kindest Regards,

Frankie Cruz
Network Administrator
Lehigh Carbon Community College
4525 Education Park Drive
Schnecksville, PA 18078
610-799-1713
fcruz@lccc.edu
parnassus
Honored Contributor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

That looks promising...
CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Thank you very much for your replay. 

It didn´t work though.

 

FalconSez
Occasional Collector

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

If you have "protocol inbound ssh" applied at the user interface, telnet
server should no longer apply.

Example:

* user-interface vty 0 4*
* authentication-mode scheme*
* protocol inbound ssh *

This is assuming that you have ssh server enabled



--
Kindest Regards,

Frankie Cruz
Network Administrator
Lehigh Carbon Community College
4525 Education Park Drive
Schnecksville, PA 18078
610-799-1713
fcruz@lccc.edu
CarolMM
Occasional Advisor

Re: Close TCP Port 23 - Telnet 3COM 5500-EI

Thank you for your replay, 

I already tried it. Once I aplied it, it no longer lets connect through Telnet, but if I do a nmap analysis it shows TCP port 23 it is still listening. 

Is there any way to close that port?

 

Thank you.