I just updated to Turis 5 and most thinks worked right (mdadm, …), but nfs did not.
When I started nfsd from Luci, i got this error:
Failed to execute "/etc/init.d/nfsd start" action: Error: XHR request timed out
/etc/init.d/nfsd start in ssh console gave me:
rpc.nfsd: writing fd to kernel failed: errno 111 (Connection refused) rpc.nfsd: unable to set any sockets for nfsd
Problem was, that
rpcbind was disabled - You can enable it in Luci - system/startup.
(Just for the record)