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I'm trying to mount a FreeNFS share located on my Windows 7 host, under my CentOS 6 virtual machine inside VirtualBox.

The networking between the host and the guest is working fine, and I've been successful in mounting an NFS share provided by a different Windows software (winnfsd, with I'm not using anymore because of a different issue).

The mount command I'm using is:

mount -v -t nfs -o vers=3 192.168.56.1:/ /mnt/www/

And the result is:

mount.nfs: timeout set for Wed Nov 19 14:50:02 2014
mount.nfs: trying text-based options 'nfsvers=3,addr=192.168.56.1'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.56.1 prog 100003 vers 3 prot TCP port 2049
mount.nfs: portmap query failed: RPC: Authentication error
mount.nfs: access denied by server while mounting 192.168.56.1:/

I've tried with vers=2, not much better:

mount.nfs: timeout set for Wed Nov 19 14:54:43 2014
mount.nfs: trying text-based options 'vers=2,addr=192.168.56.1'
mount.nfs: prog 100003, trying vers=2, prot=6
mount.nfs: portmap query retrying: RPC: Program not registered
mount.nfs: prog 100003, trying vers=2, prot=17
mount.nfs: portmap query failed: RPC: Program not registered
mount.nfs: requested NFS version or transport protocol is not supported

And vers=4, not supported by FreeNFS but just for information:

mount.nfs: timeout set for Wed Nov 19 14:56:40 2014
mount.nfs: trying text-based options 'vers=4,addr=192.168.56.1,clientaddr=192.168.56.220'
mount.nfs: mount(2): Permission denied
mount.nfs: access denied by server while mounting 192.168.56.1:/

I've also tried the following, gathered from forum posts here and there:

  • nfsvers=x instead of vers=x
  • sec=none
  • nolock
  • stopping iptables and ip6tables services on the guest
  • disabling the firewall on the host
  • ensuring that the rpcbind service is running on the guest
  • adding rpcbind : ALL to /etc/hosts.allow on the guest

But none of these solutions made any difference.

I'm surprised it's so difficult to mount a FreeNFS share. I've read this question on unix.stackexchange and this forum post: Anyone have FreeNFS working? but it doesn't seem that in either case, the OP got it working eventually.

I'm kind of desperate for solutions now, how to mount this NFS share under my CentOS 6 guest?

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  • In this thread, authentication had to be disabled to get it working. The final command, adapted to your case, would be something like: sudo mount -v -t nfs -o nfsvers=3,sec=none 192.168.56.1:/ /nas.
    – harrymc
    Commented Nov 24, 2014 at 14:49
  • @harrymc I link to this thread in my question, and mention that I tried sec=none already!
    – BenMorel
    Commented Nov 24, 2014 at 16:17
  • 1
    Sorry, I commented too quickly. More to try: (1) Disabling in CentOS selinux and firewall (if enabled; also Windows firewall), (2) Change VirtualBox networking to Bridge mode (if NAT), (3) Ensure portmap and nfslock services are started on CentOS, (4) What is the output of showmount -e 192.168.56.1 (5) Some people claim that HaneWIN is much better than FreeNFS.
    – harrymc
    Commented Nov 24, 2014 at 19:15

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