Yahoo F'up

[LunaticFringe]

Title: Yahoo F'up

I have been using Fire and noticed Proteus just today on version Tracker and downloaded it.  I would like to know if any of your users have had the following problem:

When using Proteus or Fire from work, the Yahoo server will not connect.  This problem just started occurring about three days ago and again today with Proteus.  I am using DSL through BellSouth at work.  Up until three days ago, Yahoo connected fine

When I get home and hook up to my cable modem, Yahoo server is connected just fine.  So, all of the sudden I am unable to connect to the yahoo server from work only?????  Please help if you are able...  Thanks!