my other computers suddenly lost internet connection and I do not know the security key or passphrase for the wireless. My main computer is connected via ethernet cable to the SBC 2WIRE410 gateway.
pushing the reset button on the wireless router for about 10 seconds will usually clear the password. No more password required.
unplug the modem for about 15 seconds and then power it back up, when the lights start to flash unplug the router for about 15 seconds and then power it back up, this will reset the connection. Maybe that's all it needs.