Are you running Windows Storage Server 2008 on the NX3000? From what I was able to find, In Windows Server 2008, the default limit is 16,777,216, which is, practically speaking, unlimited. In reality the actual storage will be dependent on your individual network configuration. 
Does anybody know what a reasonable number would be for the maximum number of connections on a single nx3000?  I know in reality the actual storage will have a bearing on this as well but I need to know if the nx3000 could be a cause of a potential bottleneck. Thanks Kevin
nx3000 concurrent connections