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Socket debugging
Once you have a problem with some socket communication, you must debug it. This article can help you with this task.
Packet capture
Major debug tool for each network developer is packet capturing tool. It can capture all networks packets what goint to and from your network card. Captured snapshot can be analyzed later and see what happens on the wire.
Even you not understand captured packet flow, don't be a worry! Saved snapshot in the disk file can be analyzed on any computer by any people. Just capture snapshot, save it to file and send it to person, who can help you.
Snapshot can contain any privacy data, passwords, etc. Send it to persons with yout trust only!
Recommended very good, freeware and opensource multiplatform packet capturing tool is WireShark.
