I have a few websites that I publish through the Web Application Firewall and lately a number of them are starting to perform very slowly and I can't really see any reason for it. The log for WAF doesn't show anything useful as there's no activity happening while the page is trying to load - there's no errors at all.
From a WAF point of view, the websites that do work fine and those that don't are configured the same. They're all HTTP and with no firewall profile applied. The three that are slow are all on the same internal webserver. The others that work fine are on various webservers internally. If I access the webservers that are slow through their internal addresses they work just fine.
Any ideas where I should be looking to see what might be causing this?
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