Well, seeing the dialog titled "Pocket PC Networking" with the text:
Unable to obtain a server-assigned IP address. Try again later or enter an IP address in Network settings.
Annoyed me one too many times and google hasn't quite got it yet - if you too have this problem and have any idea then please add a comment or possible solutions. My trial and error attempt at fixing it (so far) ended with using your favourite pocket pc registry editor (like PHM Regedit) and adding the following three DWORD registry keys in [HKEY_LOCAL_MACHINE\Comm\VMINI1\Parms\TcpIp] with nice and large numbers (FFFFFFFF in hex!):
This comes from MSDN's Windows CE 4 documentation but still applies.
The lack of details in the error is EXTREMELY frustrating.Permalink