I thought I would share an issue I observed on my AE this week. I was trying to setup my Slingbox AV for remote viewing and port 5001 would not work through this Airport Extreme! I am on a 192.x address space and gave the sling a static IP. Then mapped the ports in my AE which is running as my primary router/firewall not in bridged mode. Multiple restarts later and no change in status. I decided to change ports from 5001 to 1080 on both the AE and the slingbox just for S&G and bam, it worked. I am a Verizon FIOS customer by the way.
I don't know if this has been an issue for anyone else but if so, try changing the default port.
I don't know if this has been an issue for anyone else but if so, try changing the default port.