NFS mount error: RPCPROG_MNT: RPC: Authentication error; why = Client credential too weak

Bas Smeelen b.smeelen at
Fri Jul 6 18:33:12 UTC 2012

On 07/06/2012 07:25 PM, Walter Hurry wrote:
> On Fri, 06 Jul 2012 18:55:27 +0200, Bas Smeelen wrote:
>> Are you root when mounting on the client?
>>   From looking at your prompt # I think you are, but I ask just to make
>>   sure.
>> You can also take a look at
> nfs.html
>> in the handbook
> Thanks for the reply. Yes, I'm running as root on the client when I try
> the mount.
> It was the handbook I was following in my attempt to set up NFS.

With -n (allow from non root users) for mountd the mount succeeds 
although without it doesn't but you are root on the client. The nfs 
server is use is still 7.4 and I cannot find a difference in the man 
pages of 7 and 9 mountd and mount_nfs regarding to this issue.

In regard to the security implications, I think that we don't want 
mounts from trusted clients by a non root user who cannot bind to 
privileged ports, thus deny unprivileged ports.


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