Overnight one of our servers (Win 2K8 R2) began having problems connecting to a network share (Win 2K3 R2 x64) by IP.
The server has for months accessed the network share by IP for certain purposes, and the previous server it replaced did so as well.
The server can access the network share by name.
The server can ping the network share server by both name and IP.
Every other computer on the network can access the network share by name and IP.