Enabling second interface on the server without physically connecting the cable "Big Mistake"

Warning : Kids Please don't try this on any server without having physical connectivity to it,,, cuz this is a disaster waiting to happen.

This caution has been written after one such incident happened and it really was not fun to debug especially if someone from the team has done this and not informed anyone.

The server on which this was done unfortunately was the Exchange, DNS, and VPN server. After the second interface was enabled there was loss in VPN connectivity. Exchange was also giving problem's :(