Wednesday, January 14, 2009

RNDIS Vs. Win CE Host serial driver

If you are using Windows Mobile Device to sync with office PC, laptop, desktop at home and have problems connecting, simply change connection type on device to disable advanced network functionality. This applies to all Windows Mobile Based devices which supports RNDIS and Win CE host serial connection. The advantage of using RNDIS (advanced network functionality) is that the data sync rate is 3 times faster than using Win CE serial connection. To disable advanced network functionality follow the steps below:
Start- Settings - Connections - USB to PC - uncheck the box for enable advanced network functionality and press Ok to save settings. This will resolve all connectivity issues with ActiveSync or WMDC.
RNDIS (Remote Network Driver Interface Specification) : Uses the TCP/IP Connection, where system acquires an IP address from Device and registers device as a External Network adapter. If you are running security applications such as Mcafee, Symantec, Zone alarm etc your system will encounter issues connecting with ActiveSync and Windows Mobile Device Center. Easy way to fix is to uncheck the box so device uses older Win CE serial type connection.
Number of devices running Windows Mobile Professional have these settings available and you can change it. But there are certain Smart Phone devices that only support RNDIS connection. Moto Q, BJ I, BJ II and few others only support RNDIS connection. If you are having issues with these devices use alternate method to sync such as Bluetooth Serial connection over ActiveSync and WMDC.

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