VPN Connection

I purchased a brand new linksys WRT54g router for my house. The first night
that I had the router plugged in and working, I was able to use my laptop
over the wireless connection to establish a vpn connection to my company.
That was last night, well, tonight for some reason it stopped working. I
figured upgrading the firmware to the latest would fix it. Nothing, Linksys
can't give me any answers. The connection just hangs at "verifying username
and password". Has anyone got any suggestions as to why all of a sudden I
can't connect to my companies network via vpn? VPN passthrough is enabled
on the router.

Robert