Nfs – ESXi 6.0 has stopped mounting NFS Shares

nfsvmware-esxiwindows-server-2012-r2

After a reboot of a ESXi 6.0 server it will no longer mount several NFS shares being hosted on a Windows Server 2012 R2 box. Previously these shares were working fine, but now any NFS mount is met with the following error:

The NFS server does not support MOUNT version 3 over TCP

This is strange because the NFS server has both version 3 and 4 enabled

NFS Protocol Versions

Likewise the protocols have both TCP and UDP enabled.

NFS Transport Protocols

The firewall is also allowing NFS connections. I'm at a bit of a loss as to why the NFS shares have stopped being able to be mounted on ESXi. No major configuration changes have been made as far as I'm aware.

Network Setup

Two physical adapters. One configured for failover, but all traffic under one subnet 192.168.1.0/24 the same as the main LAN. No VLAN's or anything complicated.

Storage Setup

2TB Storage Space Mirror hosted on a Windows Server 2012 R2 server. 3 NFS shares set to read/write for the ESXi host with "All Machines" as read-only.

I've tried restarting the NFS Server service on the Windows Server 2012 R2 box but the problem remains.

Any ideas?

Best Answer

Disable version 4, restart the NFS service and reboot the VMWare box. You only need one of them and definatelly not both for the same share. For further details please have a look here https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%2FGUID-011DCC67-9876-4071-AED9-710D1E712E74.html

As per VMWare documentation you only need to have 1 enabled:

Make sure that the NFS server exports a particular share as either NFS 3 or NFS 4.1, but does not provide both protocol versions for the same share. This policy needs to be enforced by the server because ESXi does not prevent mounting the same share through different NFS versions.

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