I.E. 5.5

Hi,
I have a windows 2000 server with a dsl for internet access….w/clients connecting to get internet access. All of a sudden the internet access stop working. Nothing has changed on the server,nothing in the event viewer. I called the dsl provider, no problems there. Is there some kind of a log on the system or something I could ask for to help me sovle this..
Any help would be appreciated….