Disable a Serial Console Port

For security reasons, it may be necessary at times to disable a serial console port.

WARNING: Before you disable a serial console port, make sure you have Web (HTTPS) or SSH connections in order to enable the port at a later time.

The following example shows the CLI command to disable a serial console port:

(config) # no serial ?enable           

 Disable serial console access

(config) # no serial enable

The following confirmation message displays:

Disable serial console will make serial connection unusable.

Only use this config command when you have available ssh connections.

Enter ‘YES’ to confirm this operation: 

Typing YES displays the following message:

Enter ‘YES’ to confirm this operation: YES

Serial Console disabled.