That does sound like a firewall issue, or just net connection problems on his end.
You'd have to check the firewall at the same time that he's having problems.
Also he didn't say whether he checked other sites at the same time, preferably
using shift-refresh to make sure his connection isn't just flaky.
You probably need a qualified sysadmin to take a phone call from him when he's
having the trouble and check the firewall, etc.
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