I've the same problem, but with some diference.
3 W2K Servers with MS SQL Server
25 Win98se with Setup VB6 and my program
1 XP (SP1) with Setup VB6 and my program
I've this message only in the XP machine, after more less 2 hours working!!!!
Then, I need to reboot the machine and this message will show again after more less 2 hours and again and again...
Only the Crystal Reports stop working, but other functions stay working normally.
And more! I've installed the Crystal Reports Design 8.0 in this XP machine and after that 2 hours, the Crystal too can´t connect to the server!!!
Do anybody know what is happening??? :D