I have an Access 2002 managed replica set running on about 80 sites which communitcate via Indirect Synchronization with a hub replica on a server in a State Government network. Some users are connected directly, some are on DSL and some of us are on satellite or even dialup. All are using VPN security.

The problem is that computers which have been had GIS mapping software installed report "Invalid http address" when synchroniztion is attempted. However, the server involved is visible to those machines. In the past few weeks, new laptops running WinXP have also showed the same problem, even when GIS is not installed. I suspect a DLL change in MDAC or Windows. My app is written in Delphi 7, communication is via ADO. However, the synchronization problem happens whether synchronization is called from the Delphi app or the Access UI, which makes it appear likely the OS or its utilities are at fault Has anyone else ever seen this or know the cause?