Hi,
can you verify that you can reach the nfs-server (is this the correct ip address of the nfs-server)?
ping 192.168.1.12
On the nfs-server run
systemctl status nfs-server
If the service is up and running, execute
showmount -e
to see what is exported. If everything seems ok until here, try mounting by hand and paste the output:
mount -t nfs 192.168.1.12:/teste /teste
Maybe this reveals what’s wrong there.