This morning I got a bunch of calls about all of our websites/portals taking 20+ seconds to load a page. I jumped on our web server and it was running fine so I logged into the UTM and opened the WAF live log and saw a ton of these for every page request:
DNS lookup for 83.16.168.192.dnsbl.proxybl.org. failed
This the the dns reputation lookup that we current have turned on. It appears that proxybl.org has had it's DNS wiped out!
I have temporarily turned off the reputation lookup and things are again running normal. Just thought I would share in case anyone else is experiencing this.
Dave
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