Command to mount nfs share just hangs there on the command line

I'm just trying to mount an nfs share. Client: Ubuntu 14.04 to  Server: Ubuntu 12.04.
nfs-kernel-server is installed on the server and /etc/exports is set up. nfs-common is installed on the client.

showmount -e 192.168.0.142 shows the correct shares

The following command
jaga@surveillance:~$ sudo mount -v -t nfs  192.168.0.142:/home/jaga/NetBackup/ZM_Backup /ZM_Backup
gives
mount.nfs: timeout set for Wed Sep 24 21:52:50 2014
mount.nfs: trying text-based options 'vers=4,addr=192.168.0.142,clientaddr=192.168.0.70'
then just hangs there.

if I use -o nfsver=3 it gives

portmap query failed: RPC: Timed out


I have tried installing all updates and restarting the nfs-kernel-server several times. I have also tried changing the ownership of the share and creating a test share.
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Jeff swicegoodTechnicianAsked:
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serialbandCommented:
That means that it either can't find the remote system or your system is blocked from mounting nfs.

What does the following command return?

showmount 192.168.0.142
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Darr247Commented:
Check for (gigabit ethernet option) Jumbo Frame mismatches between the client and remote systems.
e.g. If the client is set to 9KB frames, set it back to 1500 bytes, restart the client's network service, then retry the NFS mount.
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gheistCommented:
check rpcionfo -p 192.168.0.142

it should show at least mountd and nfsd, and you should clearly see which versions/protocols are provided.
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Jeff swicegoodTechnicianAuthor Commented:
jaga@surveillance:~$ showmount  192.168.0.142
Hosts on 192.168.0.142:
192.168.0.109
192.168.0.120
192.168.0.126
192.168.0.128
192.168.0.130
192.168.0.131
192.168.0.133
192.168.0.138
192.168.0.140
192.168.0.145
192.168.0.163
192.168.0.166
192.168.0.180
192.168.0.182
192.168.0.192
192.168.0.193
192.168.0.43
192.168.0.46
192.168.0.53

I do not recognize these as actual clients on the network.


jaga@surveillance:~$ rpcinfo -p 192.168.0.142
   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  59381  status
    100024    1   tcp  56385  status
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100227    2   tcp   2049
    100227    3   tcp   2049
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs
    100227    2   udp   2049
    100227    3   udp   2049
    100021    1   udp  46534  nlockmgr
    100021    3   udp  46534  nlockmgr
    100021    4   udp  46534  nlockmgr
    100021    1   tcp  54478  nlockmgr
    100021    3   tcp  54478  nlockmgr
    100021    4   tcp  54478  nlockmgr
    100005    1   udp  56672  mountd
    100005    1   tcp  60918  mountd
    100005    2   udp  48698  mountd
    100005    2   tcp  38326  mountd

Both client and server have the same MTU 1500
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gheistCommented:
nfs v2/3/4 tcp or udp
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Jeff swicegoodTechnicianAuthor Commented:
Well, I had done everything except restarting the server. After restarting the server, it's fixed.
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Jeff swicegoodTechnicianAuthor Commented:
All I needed to do was restart the server.
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