We have private forums running vBulletin, and we've gotten complaints from a customer that has trouble accessing them when he opens a lot of tabs. The last time he called, it was determined that our host had automatically blocked his ip address. After opening a support ticket with the host, they unblocked it, and they said it had been automatically blocked for too many connections (I assume concurrent connections). They said there were 546 connections.
The customer is running IE8 and claims that after around 8-12 tabs, the rest "time out" - every time. And, of course, no other website has this problem.
UPDATE: It turns out that Chrome (or Firefox, but I think it was Chrome) has the same issue. But Opera seems to be fine (I'm figuring because of its aggressive caching).
With no direct access to the computers on either end, how can I hope to resolve this?
