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08.30.2008 at 04:55PM PDT, ID: 23691579
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9.1

Find available UDP ports

Asked by pancholefty in WInsock

Tags:

I need a way for a computer (Win2K and above) to dynamically find a pair of unused UDP ports. I saw a promising solution here but a follow-up comment said it didn't work on Win2K

I have a typical VB6 2-tier app using mswinsck.ocx. Each computer periodically sends UDP broadcasts to its peers with bits of housekeeping alerts, which the peers can react to as necessary.

It's been working fine on a LAN (probably by luck with the arbitrary port numbers I chose) but now I want to move it to Terminal Server. Multiple sessions can't share the same ports.

I thought maybe a .Net dll using IPEndPoint would do it but no. It can find an available port for its own use but I don't see a way to return the found port so mswinsck can bind.

It looks like using the Win API in VB6 or C++ will be a lot of work. It doesn't seem like this should be a big deal so I must be missing something.

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[+][-]08.30.2008 at 05:14PM PDT, ID: 22353637

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[+][-]08.30.2008 at 07:40PM PDT, ID: 22353924

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[+][-]08.30.2008 at 08:31PM PDT, ID: 22353997

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[+][-]08.30.2008 at 09:46PM PDT, ID: 22354071

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[+][-]08.31.2008 at 04:28AM PDT, ID: 22354703

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About this solution

Zone: WInsock
Tags: VB6 .Net C++
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Solution Provided By: xtravagan
Participating Experts: 1
Solution Grade: A
 
 
 
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