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After updating nfs-utils on my media server, Kodi (21.2) can not mount the share. Reverting nfs-utils to 2.8.7-1 resolves the issue.
I'm not sure if this is a bug in nfs-utils as other clients (such as arch) can mount without issue.
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Best guess
grep vers4.0 /etc/nfs.conf
# vers4.0=nlibnfs seems to struggle with this, try turning it back on and restarting the nfs server.
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