Restart to solve NFS Unknown error 521
I just had Unknown error 521 while mounting NFS version 3 on a Debian server after a reboot. Solving it took me some time but the solution was very easy.
My setup is NFS server on storage server running Debian and a NFS client on another Debian machine where connecting to the NFS server. After a long period of time i made a reboot on my client machine and got mount.nfs: Unknown error 521
My /etc/fstab is as follow:
1.2.3.4:/srv/nfs/web1/mail /var/mail nfs nfsvers=3,rw,async,hard,fsc,intr 0 0
I could mount it running version 4 but in verion 3 i got the error.
When i tried with -v option i got the following output:
mount.nfs -o vers=3 1.2.3.4:/srv/nfs/web1/mail /var/mail -v
mount.nfs: timeout set for Mon Sep 22 17:25:16 2014 mount.nfs: trying text-based options 'vers=3,addr=1.2.3.4' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 1.2.3.4 prog 100003 vers 3 prot TCP port 38467 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying 1.2.3.4 prog 100005 vers 3 prot UDP port 47766 mount.nfs: mount(2): Unknown error 521 mount.nfs: Unknown error 521
The simple solution was to restart the NFS server service.
On my NFS Server i did:
/etc/init.d/nfs-kernel-server restart
After that i got my NFS client to connect with version 3 on the NFS server without any errors.
mount.nfs -o vers=3 1.2.3.4:/srv/nfs/web1/mail /var/mail -v
mount.nfs: timeout set for Mon Sep 22 17:28:15 2014 mount.nfs: trying text-based options 'vers=3,addr=1.2.3.4' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 1.2.3.4 prog 100003 vers 3 prot TCP port 2049 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying 1.2.3.4 prog 100005 vers 3 prot UDP port 54305
I hope this will help someone solve this issue faster then me.
