Notice the server warning (second row):

This feature is not available on the sectors hosted by 69.Giap (Crimea and Kuban)
Moderators: IV/JG7_4Shades, 22GCT_Gross
erm why is this protection only enabled for one side?II/JG77Hawk_5 wrote:It provides a method of password protection for blue pilots seats.
If you do not enter DSC BLUE command with the password and click on a seat you are automatically kicked.
22GCT_Gross wrote:Sometimes we registered some undesiderable events, as some red players browsing on blue slots or unregistered players who joined the game and crashed with plane losses.
So we want to enable te DSC Password procedure on BLUE SIDE in order to prevent these cases.
The DSC feature is available on the servers equipped by the Dedicated Server Controller (rnzoli): 102nd Coop Dedicated and ITA-SEOW; It's not available on the Crimea and Kuban sectors hosted by 69.Giap server.
Feature Overview: http://85.14.216.230/Rnzoli/intro-coop.html