@michael.jesse:
I tried to access the GUI through a Web interface again and it did not work. I tried to ping the gateway (192.168.1.1) and it failed. I rebooted the router and ping is successful, but still cannot access GUI. I tried to get on through HyperTerminal, but that connection failed as well, both through Winsock and SSH connections. Is there any other way to access this short of reformatting?
Can you get on via keyboard and monitor? If you can, you can go into /cf/conf/config.xml and remove the errant NAT entries. Once that is complete you must reboot for it to take effect. This might allow you get in, otherwise you if you can get into console, you can set it back to factory defaults and reload from last known good backup.