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This looks like a network or firewall issue. I suggest that you check the network and firewall configurations for the affected PCs versus ones that work okay.1 person found this helpful
On another forum, I found the hint, "Another possible cause is the presence of layered winsock providers. "netsh winsock show" at a cmd prompt will show you the installed providers and you can try removing any non-microsoft ones."
Tried this and on examining the netsh output from the affected PC's, found that they have Embassy Trust Suite by Wave Systems installed. Evidently Dell pre-installed this on some of their PC's.
Anyway, on uninstalling this software, the problem has been solved.