On Thu, 25 Feb 2021 at 14:03, Ed Greshko <ed.greshko@greshko.com> wrote:
On 26/02/2021 01:19, George N. White III wrote:
> I haven't used CentOS7 for several years, so I was ignoring this
> thread in the hope others could answer.
>
> My not very trustworthy memory is that "/etc/exports" on
> the server needs the "insecure" option for NFS4 to work, see:
> https://access.redhat.com/solutions/3773891 <https://access.redhat.com/solutions/3773891> for explanation
> and some diagnostic tests.   My take on diagnostics is:

FWIW, "others" have tried changing

/home/egreshko 2001:b030:112f:2::0/64(rw,sync,insecure,no_root_squash,no_subtree_check)

to

/home/egreshko 2001:b030:112f:2::0/64(rw,sync,no_root_squash,no_subtree_check)

And the mount from an F33 system still succeeds.

The entry for "man exports":

       secure This option requires that requests not using gss originate on an
              Internet  port  less than IPPORT_RESERVED (1024). This option is
              on by default.  To turn it off, specify insecure.  (NOTE:  older
              kernels  (before upstream kernel version 4.17) enforced this re‐
              quirement on gss requests as well.)

/run/sysconfig/nfs-utils had: GSS_USE_PROXY="yes" -- wonder if GSS is somehow at play here?

--
George N. White III