test ports

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

situation: a user tries to access a web service (site) on an odd udp port. He doesn't work for them, so they want to we (ISP) to tell them if the port is blocked anywhere on the network of the ISP.

Question: I know that I can look through the newspapers and acl to trying to figure out if there is anything that might block this traffic. But what I want to do is set up some friendly service of fo that uses the same port and try to connect to this port. This way I can be sure that this IS 100% or DON'T work. Does anyone have ideas, what I can do? Or am I stuck, manually via the acl and logs? Thank you and I hope I explained it well enough.

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

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