Telnet from a Cisco VPN concentrator 300

I have a VNP tunnel set up with a client network. I can ping the external port of their router and the tunnel works well. They have a server behind that router which only have port 443 enabled. So I cannot ping this server to test if it's responding.  Is there a way I can telnet from my concentrator to their server?
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You can telnet from a machine on the VPN concentrator side of the VPN tunnel.  It sounds like the tunnel is up and works so you should be able to use a PC to telnet to it over the tunnel.
wannabecraigAuthor Commented:

I wish to telnet from the VNP concentrator, not a machine on the VNP concentrator side.  Is there any way of doing this?
No, you can't from the concentrator.  You will need to use a PC or router behind the concentrator that has it's traffic flow over the tunnel.

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"They have a server behind that router which only have port 443 enabled. "

telnet uses port 23
You can use the telnet command and specify a port other than 23.  This does a TCP handshake with the server on the port you specify.  It's a good check to see if a service is reachable.

Try it from a command prompt:

telnet 80
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