I have a Windows Server 2003 cluster of 2 nodes in an active-passive configuration. I can ping both nodes, rdp and access their unc shares. 

I also have an alias, which directs to a cluster IP set in one of the cluster groups for SQL. (I'm not the SQL administrator and have had only a little exposure to it). This alias responds to pings and RDP goes to the active node, which works correctly.

However I can't access the UNC shares for that alias. The DNS record is obviously correct as it's handling ping and RDP ok.

What's interesting is that I can RDP to the alias (which in turn is the active node) and then try accessing the unc share of the \localhost or \127.0.0.1 fails also.

I've looked at other questions on here before opening the this question and checked recent updates etc. But I feel these don't relate to my issue.

This has worked for quite a while and the only thing that has changed is that we have had to bring the whole data center down recently for much needed power maintenance work. Which makes me question perhaps a service didn't start.

Also whats worth mentioning is, is that I would have liked to failover to the passive node and see if the problem persists on that but I have a rather small time frame to take the server down which is early in the morning so I'm trying to avoid that if I can.

**Edit**

My problem appears to be that all my groups, "Cluster Group" and "SQL Group" can be pinged and RDP'd by their cluster name and cluster IP, however I cannot access any UNC share on the cluster IP or name of any of my groups.

If I browse to \SQLGroupClusterName from any networked machine I get "The network path was not found" error.

If I rdp to SQLGroupClusterName (which works) then browse to \SQLGroupClusterName from QLGroupClusterName I get the same error message.