Network connections only work if device connected via cable

Question

Ok, I tried for the last couple hours and I give up: I develop for a mobile device (Win CE on Unitech HT660) and have a weird thing occurring: I try to communicate with a service on my PC and I'm using TCPClient for it.

This works great except for one big problem: Once I unplug the USB-Cable I use to copy the files from VS on program start TCPClient throws a SocketException that no socket connection could be made because the target machine actively refused it (not the case, Firewall is off, no third-party installed and the service is listening)

And it gets weirder: If the cable is plugged in and I remove it after the program made the connection everything works perfectly fine, I can send and receive data without the cable, I can just not connect without the cable.

Btw: It's the same story with MySQLConnection from the MySQL .NET Connector. It works with the cable, but if it is removed without an established connection no connection can be made.

Has anyone ideas on that?

Thanks in advance!

PS: One thing I forgot to mention: I use wireless to connect to my network, and IE as well as pinging the computer with the service and mysql database on it works.

Answer 1

If you're using Vista / Win7, check if the wireless network is set as private / office network. Having it set to public network causes very weird symtoms.