"At least some of the servers that I can't access are using NFSv3"
It has been my experience that NFSv4 on Solaris 10 and NFSv3 on other hosts,
including NetApp filers, cause all sorts of problems. Either you get "No
Directory" or the directory/files are owned by "nobody".
We routinely modify /etc/default/nfs and set
NFS_SERVER_VERSMAX=3 (or even 2)
The problem goes away after you restart nfs/client or nfs/server.
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