Solution : https://service.sap.com/sap/support/notes/702584 (SAP Service marketplace login required)
Key words : 
terms adminenabled ~command=logoff agatecommand agate command reason, registry switch adminenabled, command mode disabled, install its620 patch 9, agate command, ~command=logoff, registry switch, agate commands, logoff properly, its620 patch 7
Related Notes : 
       
| 710041 | Composite SAP Note on security in the ITS | 
| 682759 | |
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 330793 | Downloading patches |