Hey,
After bashing my head on several walls I've somewhat been able to find the problem. My clients keep complaining that they have trouble accessing services hosted with me, I was troubleshooting a client where I noticed that the ISP provided DNS servers were not resolving any domain on my server and when I added either OPenDNS or Google's DNS server's they'd work fine.
I've looked at the Blocking section but can't find those IP's, so I whitelisted them, flushed the client's ipconfig and it started working. Any idea how I can trace what exactly it causing ASL to block these IP's?