Can some please confirm winsock

[bushman_222]

Hey all.

Can some please confirm some winsock items, I am starting to doubt my self about it now.

The question is this:
If you created a client server program, what port does the client winsock.localport actually connect? Is it the same port that you request it connect to, or is it different?

Can someone please create a simple client server program to either test wheather I'm going insane or not?

[jonc]

Hi bushman_222 :)

I've just ran my server/client app which I'm working on and then did a netstat -a at the command prompt to check the ports that are being used...

TCP jcxp:1448 localhost:49551 ESTABLISHED
TCP jcxp:49551 localhost:1448 ESTABLISHED

jcxp is my machine name, so it appears that the client uses port 1448 and the server uses 49551 (which I set it to use).

I closed the app and re-opened it and the ports have changed slightly...

TCP jcxp:1457 localhost:49551 ESTABLISHED
TCP jcxp:49551 localhost:1457 ESTABLISHED

So it appears the client will use any port, but as it is the one initiating the connection with the server, then I presume the server will reply to the client port that it contacts the server through.

Hope that helps.

[bushman_222]

That is great, thank you. That eliminates that possibly,

Thanks again jonifen

[jonc]

That is great, thank you. That eliminates that possibly,

Thanks again jonifen

No problem, glad I could help.

One more thing though, I tried connecting from 2 different computers at the same time to the same server application which was on a 3rd computer. One worked, the other sat there waiting, didn't time out or anything. If I disconnected the first computer, the 2nd would auto connect after a pause of a second or so.

Definitely seems that its one connection per port, so if you're hoping to use a client and management tool at the same time, you may have to add another winsock control to the server application (unless there is a guru who knows a way around it :))