I'm running an NFS server on Debian 11 (Bookworm) I'd installed the package nfs-kernel-server and have the following in my /etc/exports


For some reason, some of my clients can access these NFS shares without any problem... specifically a Windows 10 PC, and Kodi running on a Google Chromecast.... yet other clients, specifically my raspberry pi devices, cannot access these NFS shares. They appear to mount, but I cannot access the directories at all, not even as root.

sudo showmount -a on the server shows the clients are in fact connected.

john@thindebian:~$ sudo showmount -a
All mount points on thindebian: is my Google Chromecast and are my raspberry pis is my windows 10 pc

the mount command on the raspberry pi shows the share is in fact mounted on /mnt/2TB type nfs (rw,noatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=,mountvers=3,mountport=43215,mountproto=tcp,local_lock=none,addr=

The file permissions for the shared directory are

drwsrwsrwx 1 nobody nogroup 2.6K Dec  2 00:04 2TB

Oddly enough.... this was all working fine a month ago and just stopped working on the raspberry pi devices.

I'm at a loss as to where to go from here. Perhaps I'm just missing something obvious, I don't know.... Can anyone offer any suggestions/assistance?

  • Dont know if it might point to the problem, but when it was working fine, i wasnt using the insecure parameter, but then one day nothing could connect...but adding that insecure parameter now at least lets the chromecast/kodi and windows pc connect. Commented Dec 2, 2022 at 22:45
  • When you mount on your Raspberry client what do you get by using sudo mount -vt nfs (-v for verbose mode)? Commented Dec 3, 2022 at 8:35

1 Answer 1


Check your /etc/nfs.conf file for udp=n.

Re-enabling it should allow your UDP based clients to connect.

Bookworm Bug - NFS UDP disabled by default

  • I don't have nor want any udp clients connecting. I'm specifying proto=tcp in the fstab file Commented Dec 31, 2023 at 5:34

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