WRT350N unable to forward single port to VPN.

I set up a PPTP (VPN) server on my network so that I could access stuff at home when I am not. I went to the router to configure router to forward the port for VPN -- 1723 -- to the IP of the the server and got the following error:
Port overlap occured! Please change your entry!
I am running firmware version 1.04.3 and have tried 1.03.7 without any luck. I originally configured with a previous version of the firmware and have haven't had a need to change the configuration. I tried to save the settings without any changes and got the same message. The current port forwarding is:
SMTP                                              172.16.0.2      enabled
POP3                     172.16.0.2 enabled
FTP                                      172.16.0.2      enabled
HTTP                                  172.16.074      enabled
None
Braindead       2525   25        Both    172.16.0.2       enabled
IMAP              143     143      Both    172.16.0.2       enabled
Print                515      515      Both    172.16.0.240   enabled
WebMail        3000    3000    Both    172.16.0.2       enabled
MailAdmin     1000    1000    Both    172.16.0.2       enabled
VNC                 5900    5900    Both    172.16.0.2       enabled
VNC+1            5901     5900 Both    172.16.0.51 enabled
VNC+2            5902     5900    Both    172.16.0.74     enabled
VNC+3            5903     5900    Both    172.160.3        enabled
Blank
I dont' have any port overlaps. I have changed everything and nothing works. It was working perfectly under the original firmware. This router is less than a year old. I have looked at other threads that are serveral months old without a new post and without a resolution. I am going to need to change the web server as the machine that was running the web server is now dead and I CANNOT change the address. I wish there was a way to go back to original firmware.   I even tried to reset the router to factor defaults and could not change the port forwarding.
HELP
George Worley

ridcully wrote:
Yes, you are right you don't have any port overlaps...Well, you should check the subtabs "Port Range Forwarding" and "Port Range Triggering" and check if you have any port overlaps there...Also did you reset your router after the last firmware upgrade ? If not you must reset your router and re-configure it from scratch...
Do not have anything under either one of those tabs until now because I need to get VPN established. That is under "Port Range Forwarding" and it is just a single port -- 1732 (VPN).
Steps
Backed up configuration to a file.
Flashed with 1.03.7
Power Cycled WRT350N
Tried to add a single port forward for VPN.
Got Error
Followed the same with the above steps.
Got the same error.
Pushed in the "Factory Defaults Button" for about 45 seconds.
Now with Factory Defaults
Configured for ISP.
Tried to add in just a POP3 server with no other ports defined.
Got the same error.
Flashed with 1.04.3.
Power Cycled
Set back to factory defaults.
Configured for ISP.
Tried to add POP3 server with no other ports defined.
Got the same error.
Flashed with 1.03..
Power Cycled
Set back to factor defaults.
Configured for ISP.
Tried to add POP3 server with no other ports defined.
Got the same error.
Flashed back to 1.04.3.
Restored back up. Old ports are still defined and still can not map new ones.
I think that the firmware version that was on it when I bought it was 1.03.2 -- wish that I had never upgraded it.
Thank you,
George Worley

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