Hi,
If he is running a 8700 or a 7300 (not sure on that model) there is a blackberry OS issue according to Cingular. They said RIM is aware of it and working on it and that it may result in stability issues. You may want to find out his model and make sure there are no known issues.
I had to rule out my Blackberry as a issue so I was talking to cingular today about hthis. They warned me that the connection may not be stable.
You may also ask him to document signal strength and check his throughput. If your throughput is slow windows automatically goes into "slow connection" mode and won't pull over alot of details.
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by: RobWillPosted on 2006-10-26 at 17:56:58ID: 17816405
There are often 2 problems; bandwidth or quality of the service, and the fact that some mobile service providers assign private rather than public IP's. The latter is not the case, or at least not a problem if you are able to establish a connection, even if briefly. As for the connection, I have succeeded with some cell phone providers. You might want to try lowering the MTU (Maximum Transmission Unit) on the connecting PC. This often helps with unstable or lower performance connections. To lower it on the PC the easiest way is to use the Dr TCP tool from http://www.dslreports.com/ drtcp The default is 1500. Try lowering it to 1260 and see if there is an improvement. If so gradually increase it. If you are using a PPTP VPN do not increase above 1430. A couple of articles outlining the problems and how to adjust the MTU can be found at: faq/7752 /vpnslow.h tm
http://www.dslreports.com/
http://www.chicagotech.net