Ubuntu 16.04 LTS Am I missing something?

MAFoElffen Thank for the reply
When the new 16.04 LTS is on my local network 192.168.150.7 I can ping, I can SSH into it no problems. But I change the interface from:
#The primary network interfaces
auto eno1
iface eno1 inet static
address 192.168.150.7
netmask 255.255.255.0
network 192.168.150.0
broadcast 192.168,150.255
gateway 192.168.150.1
dns-nameserver 192.168.150.36

Change to Production server address that is currently working :

#The primary network interfaces
auto eno1
iface eno1 inet static
address 192.168.155.10
netmask 255.255.255.0
network 192.168.155.10
broadcast 192.168,155.255
gateway 192.168.155.1
dns-nameserver this is the ip address of my inteet service provider

The only difference between current working production configuration and new server is the name of the Etheet port.
Old server eth0 New server eno1
I do not change that on the new server. It stays at the eno1.
Again unplug the network cable from old server and plug in the new server and nothing unable to ping, unable to SSH, unable SFTP. It is like it is not there.
Why?