NFS timeout

when trying to mount a directory via NFS I run into a timeout.

on the server, which runs 42.3… after a fresh install.

exportfs


  /mydata         <client-ip>

on the client, which runs 42.2, nothing had been changed. there had been no rpoblems with the former server.

showmount -e


  /mydata             <client-ip>

mount -vvv :/mydata /sdisks/mydata
(tried as well with “-t nfs” and “-t nfs4”


mount.nfs: timeout set for Sun Jul 30 15:32:01 2017
mount.nfs: trying text-based options 'vers=4,addr=<server-ip>,clientaddr=<client-ip>'
mount.nfs: mount(2): Connection timed out
mount.nfs: Connection timed out

had as well tried to disable firewall -> no effect

does anyone have an idea how to perform the NFS mount? Why does it run into a timeout?

remark:
access to the directory from a win-computer via samba works

Try mount using NFS v3.

tried both, no difference

SOLVED: nfs4 was missing on the client