Topic awaiting preservation: Telnet Different Source and Dest Ports

On the computer at work I am able to use telnet and SSH to connect to a remote machine through the standard ports. However, a client I want to connect to uses the port 6101, and this port is blocked by an internal. Is it possible for me to connect to this client?

is it possible to do something similar to telnet -lp 21 dnsname remoteport

The way I did this before was to SSH to a remote host and then telnet from the host that has a less stringent firewall. I just had the remote host that I ssh into die on me, and it will be hours before I can gain physical access to figure out why it is gone.

Is there any workaround that doesn't involve using an intermediary?

Dan @ Code Town

As far as I know, if the client is only listening on that port, then you will have to use some type of intermediary to get access.

You could probably write up a quick proxy to do the job. Java makes it easy to do such things - the only issue is can your client install and run it?

"Nothin' like a pro-stabbin' from a pro." -Weadah

Wouldn't the local proxy still be unable to connect on 6101 if it is blocked by the firewall?

Dan @ Code Town

I'm pretty sure you would have to open port 6101 on the firewall. This can be done for just those two machines and for just the telnet protocol.