Running WM5 on a Axim X51v, Active Sync 4.0

I have started getting the following error on connect

"Unable to Obtain a Server assigned IP address. Try again later or enter an IP Address in Network Settings".

The device Syncs OK, but I do wonder why this message has started to appear. I must have an accidental switch set somewhere I presume.

Any help that could be shed on this matter would be greatly appreciated.