Hello everyone,

First let me preface by saying, I know this is very old, and if I did not need the server to continue, I would scrap it and install a fresh new OS. However, that being the case, I am stuck with it for now.

I have everyone working like I would expect, except NFS. For some reason when I use the mount -t nfs server:/share/123 /mnt/share it gives me an error:

mount server reported tcp not available, falling back to udp
mount: RPC: Program not registered

I have other linux servers that can access it just fine. Here is the weird part...it was working before. We needed to reboot the server, and when we did, it just stopped working. /etc/fstab has not changed, but for some reason it will not mount the NFS share any longer.

Things I have tried:

stoping/restarting/rebooting portmap, nfs, nfsboot, nfslock
Messing about with the firewall - currently shut off
creating new local folders to try and mount it there
checked and rechecked /etc/exports on the nfs server
tried mounting via IP rather than name
checked /etc/hosts.allow /hosts.deny
Verified that the NFS server is hosting NFS 4,3,2

I am able to ping by name and IP. I can SSH and SCP.

Is there something I am missing? Normally setting up NFS is super fast and easy...

Appreciate any help you can give.

All the best,

I just noticed this:

On server 1 (the server I am trying to connect to) I get this:

# rpcinfo -p server1
program vers proto port
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 46075 status
100024 1 tcp 50007 status


On another server that we have, I get this (Mapping works fine)

# rpcinfo -p server2
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 838 status
100024 1 tcp 841 status
100011 1 udp 773 rquotad
100011 2 udp 773 rquotad
100011 1 tcp 776 rquotad
100011 2 tcp 776 rquotad
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100021 1 udp 32768 nlockmgr
100021 3 udp 32768 nlockmgr
100021 4 udp 32768 nlockmgr
100021 1 tcp 32773 nlockmgr
100021 3 tcp 32773 nlockmgr
100021 4 tcp 32773 nlockmgr
100005 1 udp 789 mountd
100005 1 tcp 792 mountd
100005 2 udp 789 mountd
100005 2 tcp 792 mountd
100005 3 udp 789 mountd
100005 3 tcp 792 mountd


I am not seeing nfs on server1 for some reason. However, if I jump on another linux box, and point it at server1 they showup just fine

#rpcinfo -p server1
program vers proto port service
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 662 status
100024 1 tcp 662 status
100011 1 udp 875 rquotad
100011 2 udp 875 rquotad
100011 1 tcp 875 rquotad
100011 2 tcp 875 rquotad
100005 1 udp 892 mountd
100005 1 tcp 892 mountd
100005 2 udp 892 mountd
100005 2 tcp 892 mountd
100005 3 udp 892 mountd
100005 3 tcp 892 mountd
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100227 2 tcp 2049 nfs_acl
100227 3 tcp 2049 nfs_acl
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100227 2 udp 2049 nfs_acl
100227 3 udp 2049 nfs_acl
100021 1 udp 32769 nlockmgr
100021 3 udp 32769 nlockmgr
100021 4 udp 32769 nlockmgr
100021 1 tcp 32803 nlockmgr
100021 3 tcp 32803 nlockmgr
100021 4 tcp 32803 nlockmgr

I checked and the firewall is turned off, what am I doing wrong?

The different results of "rpcinfo -p" for server1 do not make sense.
On each NFS client check what server1 is