I am having a real issue with sharepoint 2010 today.
I have 3 domains in my network. domain a,b,c.
Domain A is the top. Domain b has the sharepoint server and is working fine for people in this domain. Domain c is where the issue is. This was all just working this morning, but for some reason its not this afternoon. They can ping (by name and IP) the sharepoint server in Domain b, but when they try to go to the url for the sharepoint site nothing comes up.
I can still set privileges on the users in Domain C from Domain B sharepoint administration but they still cannot see it.