Trouble port forwarding

Hello,

I have been running a Minecraft Bukkit server for some time now over Hamachi and I have been trying to switch it over to a port-forwarded server but I have been having some trouble. I have a late 2012 Apple AirPort Extreme as my wireless router and my ISP is Comcast. I have port-forwarded port 25565 and port 80 on the wireless router but when I try to check if those ports are port-forwarded on http://www.canyouseeme.org/ it says that it isn't port-forwarded. How can I fix this issue?

 

Could this be a problem with Comcast? Has anyone else ran into this issue?

 

This could be a number of things:

• Locally-installed firewall (Windoze Firewall, Norton, McAfee, ZoneAlarm, et cetera) is blocking the incoming connections
• AirPort Extreme not configured correctly to forward the port to the appropriate location
• Comcast's modem may have routing capabilities enabled, putting your server behind a double-NAT
• Comcast may simply be blocking certain ports; some ISPs don't like their customers running servers on their residential connections