Follow these steps below to disable Internet connection on a remote server:

1. Open Ethernet settings

On the remote server, open Ethernet settings by searching for “Ethernet” from the start menu.

2. Choose Change adapter options

3. Disable two Ethernet connections

• Right-click on the first Ethernet » choose Properties » then tick Internet Protocol Version 4 (TCP/IPv4) » OK.

• The Internet Protocol Version 4 (TCP/IPv4) Properties appears. 

• In the  General tab, you’ll see the initial DNS server addresses:

Preferred DNS server: 192.168.20.253
Alternate DNS server: 192.168.20.252

• Now, replace them with the following DNS server addresses:

Preferred DNS server: 10.0.0.1
Alternate DNS server: 10.0.0.2

• Choose OK.

Similarly, disable the other Ethernet. Already disabled two Ethernet connections.

4. Enter the initial DNS server addresses before shutting down the remote server