Can't Access Router

I have two computers (Mac and PC) connected to a cable modem via Belkin router. Both can connect to the Internet.

My Power Mac G5 2Ghz has two internal hard drives. My primary boot drive has Leopard 10.5.6 and the secondary has Tiger 10.4.11.

I had the built in Firewall set for "Allow only Essential Services" then I changed it back to "Allow all incoming connections" before I installed Netbarrier X5. My access to the internet and router/control panel was fine.

Then suddenly my G5 (Leopard) was no longer able to log into the router/control panel only the PC (Windows XP). Tried Safari and Firefox and both come back with the error message "Safari can't connect to server."

When I boot the G5 into "Safe Mode" it is the same thing, can connect to the internet but have no access to the router control panel. So it can't be Netbarrier.

But If I my G5 reboot with my second drive that has Tiger. My access to the router's control panel is restored.

I am also trying out OpenDNS. When I rebooted into either Mac OS (Leopard or Tiger) and turned the service on or off, the results are the same.

Is there some setting or preferences under Leopard that needs to be changed or deleted? Or is it something else?

Are you sure Netbarrier is turned off when in Safe Mode? It sure sounds like your access to the router setup menu is being blocked by a firewall. Either that or the Leopard firewall is somehow blocking access.

Something you can try: Reset the router back to factory default (usually done by pressing a reset button on the rear of the router) and see if that works to restore your access.

Regards.

I will try resetting the router.

If that does not work, is there a way to reset the Mac OS X firewall or some preference to trash?

Also, is there a particular system log I should be looking at?