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https://issues.apache.org/jira/browse/GUACAMOLE-449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279911#comment-16279911
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Michael Jumper commented on GUACAMOLE-449:
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If you see the "key" instruction sent over for the Alt key, then the Guacamole
side of this is working correctly. As the only difference here between the key
working and not working is the setup of the VNC server or OS, there must be
something specific to the VNC server, OS, or both which is preventing the Alt
key from working as expected.
As long as the Alt key is correctly handled client side, sent over as a "key"
instruction, and finally forwarded along the VNC connection as a key event,
then there is nothing else for Guacamole to do with that key. The failure must
be at or beneath the VNC server level, independent of Guacamole or VNC client.
> ALT key not working with Windows Server 2012 R2 Standard
> --------------------------------------------------------
>
> Key: GUACAMOLE-449
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-449
> Project: Guacamole
> Issue Type: Bug
> Affects Versions: 0.9.13-incubating
> Reporter: Charles Rolls
> Priority: Blocker
>
> Using VNC protocol (pvnc, tightvnc) on device running Win2012 R2 with a
> reverse connect back to GuacD running in docker container on CentOS and
> client in IE 11 or Chrome 62.0.3202.94 running on Win7, when I hit the ALT
> key nothing happens on the device.
> I am using web sockets in the browser to connect to a Java Guacamole servlet
> utilizing the Guacamole library in a Spring Boot app (Wildfly) to connect to
> GuacD. I have run this servlet on Windows and CentOs docker container with
> the same issue.
> Thru the browser client, I'm in Notepad on the device and I hit the keyboard
> L/R ALT key to bring focus to the menu. I see the guacamole protocol "keys"
> instruction get sent over the web socket but nothing happens on the device. I
> originally found this problem by adding a button to my HTML page to call
> Guacamole JS client sendKeyEvent method to send the key combinations (L_ALT
> pressed, TAB pressed, TAB unpressed, L_ALT unpressed). I have a button for
> Windows key and CTL+ALT+DEL also. The Windows key works and the funny thing
> is the CTL+ALT+DEL works sometimes but ALT+TAB never works.
> Everything works fine with device running Win7 or Win10. It is only a problem
> with WinSrv2012. I tried all combinations of the sendKeyEvent method with
> things like delay between key press / unpress. That is what lead me to just
> seeing what the keyboard ALT would do instead of clicking a button to do the
> sendKeyEvents.
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