Tcp ports open?

Unanswered Question
Feb 13th, 2009

Hello, i've got two Catalyst 3950 connected on stack for the production network and another 3950 catalyst for the test network. There is a crossover cable from the Catalyst of test network to one of the production catalyst in order to give them conectivity.

Now, somebody wants to comunicate from a workstation on the test network to a server on the production network. I can perfectly ping, but this user tells me that he needs to conect using tcp ports 1433 and 5084.

Is there anyway i can test those ports from the switches?

I have this problem too.
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Giuseppe Larosa Fri, 02/13/2009 - 03:27

Hello Francisco,

you can test by using

telnet ip-address tcp-port-number

On IOS based switches

to see if you can access the service on the specified port

Hope to help


SpeedLottery Fri, 02/13/2009 - 04:11

NetworkSwitch1#telnet 192.168.165.XX 5084

Trying, 5084 ... Open

NetworkSwitch1#telnet 192.168.165.xx 1433

Trying, 1433 ... Open

Hi, i got this answer from the switch, i gues that means the port is listening on the specific machine. That means tcp port is open i guess?

Giuseppe Larosa Fri, 02/13/2009 - 05:06

Hello Francisco,

yes if you see open you have a session with the server

with http server you can type


and you should see a reaction of the server

Hope to help


ccannon88567 Fri, 02/13/2009 - 04:25

Never occured to me that you could run this command from IOS! Thanks Giuslar.


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