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Technical - intermittent networking problem
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Question
DTMark
Just looking for some suggestions as this has me stumped. Actually, I don't do this sort of support, because it's a nightmare, but I seem to have got sucked in to this and I'm intrigued..
Client in London. Their website is hosted in a DC in Manchester.
Periodically they can't access their own website. They can access everything else. Theirs just times out - it's a connection timeout rather than a website bug or database deadlock.
It's not DNS. A traceroute looks normal. The internet connectivity is not sporadic. Still nothing. For about half an hour, then it just starts working again.
Seemingly everyone else can access the site, just not the client. Throughout, it loads perfectly for me. I'm not in their office. All the machines in their office develop the same problem at the same time.
There's nothing like Active Directory involved here. Just a bunch of machines on one internet connection that cannot load one site and only that one (though I haven't tried every single website in the world to prove that).
The server does have active threat monitoring. Maybe it's that - their admin area is part of the same site. Maybe it thinks their access is suspect and locks them out for a while. This is my best theory. However the DC says not. Their fixed IP is whitelisted.
Turning the modem off and on again achieves nothing.
Next step is to disable the active threat monitoring however this only happens about 4 times a month and I don't want to leave that disabled in perpetuity to "see if that's probably what it was".
Any ideas..
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