I, too, am having a problem where widefs simply quit connecting. As far as I can tell, there have been no significant network or OS changes to cause this. The client and FS side can ping each other, they see shares on each other and there are no AV restrictions. Both connect to the 'Net as before. For kicks and giggles, I even added the .exe to my wife's computer (don't tell her!) and it, too, was unable to connect to the FS box. I "reinstalled" the widefs components on both sides, without effect. I had recently completely reinstalled widoze onto the FS box but, again, everything was working after that up until this weekend. Thanks for your help.
V/r,
Ken