testing ports

[b.withrow]

Kind of a weird question here but I hope someone has some advice.

situation: a user is trying to access a web service (site) on an odd udp port. It's not working for them, so they want us (ISP) to tell them if the port is being blocked anywhere on the ISP's network.

Question: I know I can look through logs and acl's to try and figure out if there is anything that would block that traffic. But, what I would liek to do is, setup some kind fo service that is using the same port, and try to connect to that port. This way I can be 100% certain that it DOES or DOES NOT work. Does anyone have any ideas what I can do? Or am I stuck, manually going through the acl's and logs? Thanks, and hopefully I explained this well enough.

[varakantam]

You can use netcat toolset to emulate the server and use either nemesis/hping to intiate connection. I would recommend accesslist for that particualr user to see where it is being blocked.

[jackko · Accepted solution]

a tiny utility from microsoft named ttcp.exe, which will listen to a specific port (udp or tcp) on a pc or server.