Prompt when logging out from the button in the yellow bar (users may think this will only disconnect the session with the yellow bar in question, when in reality all sessions will be disconnected).

guacamole/src/main/webapp/scripts/interface.js

@@ -2,6 +2,9 @@
 // UI Definition
 var GuacamoleUI = {
 
+    "LOGOUT_PROMPT" :   "Logging out will disconnect all of your active "
+                      + "Guacamole sessions. Are you sure you wish to log out?",
+
     /* Detection Constants */
     
     "LONG_PRESS_DETECT_TIMEOUT"     : 800, /* milliseconds */
@@ -296,8 +299,13 @@ var GuacamoleUI = {
     GuacamoleUI.buttons.logout.onclick =
     GuacamoleUI.buttons.touchLogout.onclick =
         function() {
-            window.location.href = "logout";
-            GuacamoleUI.hideTouchMenu();
+
+            // Logout after warning user about session disconnect
+            if (confirm(GuacamoleUI.LOGOUT_PROMPT)) {
+                window.location.href = "logout";
+                GuacamoleUI.hideTouchMenu();
+            }
+            
         };
 
     // Timeouts for detecting if users wants menu to open or close