We have a client with a windows network with a domain and mostly windows PC's, however they do have 2 Macs in their graphics dept. The Macs connect to a share on a domain attached windows 7 VM which they connect to with a domain username/password - this works fine and has for a year or so.

Recently about once a week when the Macs power up they can't connect to the share, they can see it but are repeatedly asked for a username and password. If I log in directly on the windows 7 VM as each Mac user then the macs themselves connect again.

I've tried several things to resolve this but so far it continues to happen, the work around to get them connected again is simple enough but I need to find a permanent resolution if possible.

Any suggestions or ideas are welcome!