I use UltraVNC (ports 5900 & 5800) and I recently purchased a TrendNET TEW 652BRP (Wireless N) router replacing a TrendNET TEW 432BRP. The 432BRP worked fine as did other routers before it. I have set up a static IP and PFPortChecker tells me that both ports are open. Several weeks ago I went through the process of submitting a new router to portforward.com but have not heard from them. I have even tried putting back the 432BRP and it still works fine. The router software is very similar between my to routers. Initially, I tried just setting the Virtual Server settings. I then tried adding UltraVNC to the Special AP section for Port Triggering. I have tried putting the computer in the DMZ and turning off my Norton Internet Security Firewall. All have failed.
#1 - I have followed the Trendnet TEW-632BRP in the past and just went through it again. The only difference being that I added the 5800 configuration and page 19 ofhttp://www.jims-Place.com/files/TrendNet_TEW-652BRP_Wireless_N_Screenshots.pdf now also includes the 5800 configurations for TCP & UDP. It still doesn't work. Also using DMZ still doesn't work.
#2 - My connection is Internet => Cable Modem => TrendNET TEW 652BRP => Wired to an HP desktop running XP.