Net Application Windows Mobile 6.0 cannot access webservice on IIS7.0 WS2008

I have CFv2.0 VB.net application running on PDA 6.0 accessing webservices all the time for data exchange. Number of PDA's are more then 20 all accessing the webservice on Windows Server 2008 II开发者_开发知识库S7.0 all of a sudden some PDA's stop working (cannot access web service) and get web no connection exception. Can access the service from IE.

Any clue?

Cheers

Gauls

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changing new PDA helped to improve connectivity