OK we have three MACs, the department that uses these macs have been to a remote site and are now on a different subnet to the storage servers.
I can not browse the rest of the domain on different subnets. This therefore means I can not browse to there file shares. I can ping these servers from the MACs and connect to intranets and other internal sites on different subnets. so no it is not a connectivity problem. I can also access these shares from WIndows pc's on the same subnet as the MACs. There are no firewalls/antivirus preventing the MAC's browsing the other subnets. Any ideas?
Did you disable SMB signing on file servers?
These knowledge base article contains information on how to enable/disable SMB signing for variuos MS operating systems:
"Overview of Server Message Block signing"