Originally posted by TheMayhem
vBulletin Options -> Server Settings and Optimization Options -> *NIX Server Load limit
That would be the cause of that error afaik. Setting it to 0 will allow users to login, i think

Do you have SSH access? What server load does the "uptime" command return? (also available in the admincp on the homepage)
It sounds like a really weird problem, good luck solving it!
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