I know there's a few thread on this but nothing there is working. I'm using VS 2003, ActiveSync 4.2 and Symbol MC3000 device running on Windows CE.
Everything was working fine for like 3 months and then this problem occur when I want to debug on the device...
Error: Cannot establish a connection. Be sure the device is physically connected to the development computer.
I've tried uninstalling and reinstalling ActiveSync, ProxyPorts and DelDesktopCryptKey...and none of those worked.
Any advice

Error: Cannot establish a connection. Be sure the device is physically connected to the development computer.
pessi
This link should help you - http://www.microsoft.com/downloads/details.aspx FamilyId=7EC99CA6-2095-4086-B0CC-7C6C39B28762&displaylang=en
More information on this in this page - http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=551805&SiteID=1