From Security Center Web Client, you can prevent all access through a door by deactivating (shunting) the reader.
Not all readers can be disabled from Security Center
Web Client. The ability to shunt a reader
depends on your access control equipment. Shunting a reader is equivalent to cutting the power
to the reader. For this reason, a cardholder presenting a valid credential at the door would
no longer be able to unlock the door. This however does not prevent someone from unlocking the
door with a key.
The reader is now disabled, preventing access from that side.