I am plaqued with this problem of trying to resolve this corporate level implementation of using our existing several terabytes of storage as local storage on our ESXI host. I have no trouble mouting the NFS Storage, permissions have been set. All of the visible and logical network pieces are in place. Have set up as indicated in several forum. Created a VM Kernel as they connection type, created a Virtual Switch, labeled the NFS Storage. Their are no firewall existing that can be seen. Can ping in both directions. But when it comes down to Trying to upload a file or create a directory on the NFS Storage, i get an I/O error occured. The NFS Storage is on a Windows Server 2008 Server and ESXI host is ESXI 4.1.