I'm also struggling with getting this going. We're using UltraVNC as well,
and have enabled MS Logon.

I built guacamole-client and guacamole-server from source (pulled this
morning from GitHub) on Ubuntu 18.04, and when I try to connect, the web
client gives the message:

The remote desktop server is currently unreachable. If the problem persists,
please notify your system administrator, or check your system logs.


Looking at journalctl, the logs from guacd are:

Jan 30 21:47:13 mars-ubuntu guacd[1720]: Creating new client for protocol
"vnc"
Jan 30 21:47:13 mars-ubuntu guacd[1720]: Connection ID is
"$6d308e74-dc49-48d3-b331-a0869b31d31f"
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Processing instruction: size
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Processing instruction: audio
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Processing instruction: video
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Processing instruction: image
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Processing instruction: timezone
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Cursor rendering: local
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "swap-red-blue" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "read-only" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "color-depth" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "dest-port" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "encodings" omitted.
Using default value of "zrle ultra copyrect hextile zlib corre rre raw".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "autoretry" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "reverse-connect"
omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "listen-timeout" omitted.
Using default value of 5000.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "enable-audio" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "enable-sftp" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-hostname" omitted.
Using default value of "10.6.130.102".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-port" omitted.
Using default value of "22".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-username" omitted.
Using default value of "".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-password" omitted.
Using default value of "".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-passphrase"
omitted. Using default value of "".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "sftp-root-directory"
omitted. Using default value of "/".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter
"sftp-server-alive-interval" omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "recording-name" omitted.
Using default value of "recording".
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter
"recording-exclude-output" omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "recording-exclude-mouse"
omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "recording-include-keys"
omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "create-recording-path"
omitted. Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "disable-copy" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Parameter "disable-paste" omitted.
Using default value of 0.
Jan 30 21:47:13 mars-ubuntu guacd[9233]: User
"@23c401c7-3b40-4084-856b-74d17931984d" joined connection
"$6d308e74-dc49-48d3-b331-a0869b31d31f" (1 users now present)
Jan 30 21:47:13 mars-ubuntu guacd[9233]: Client is using protocol version
"VERSION_1_1_0"
Jan 30 21:47:15 mars-ubuntu guacd[9233]: VNC server supports protocol
version 3.8 (viewer 3.8)
Jan 30 21:47:15 mars-ubuntu guacd[9233]: We have 2 security types to read
Jan 30 21:47:15 mars-ubuntu guacd[9233]: 0) Received security type 17
Jan 30 21:47:15 mars-ubuntu guacd[9233]: 1) Received security type 113
Jan 30 21:47:15 mars-ubuntu guacd[9233]: Unknown authentication scheme from
VNC server: 17, 113
Jan 30 21:47:15 mars-ubuntu guacd[9233]: Unable to connect to VNC server.
Jan 30 21:47:15 mars-ubuntu guacd[9233]: User
"@23c401c7-3b40-4084-856b-74d17931984d" disconnected (0 users remain)
Jan 30 21:47:15 mars-ubuntu guacd[9233]: Last user of connection
"$6d308e74-dc49-48d3-b331-a0869b31d31f" disconnected
Jan 30 21:47:15 mars-ubuntu guacd[9233]: Requesting termination of client...

I'm able to connect to other computers that are running x11vnc, but am
struggling to get it working with UltraVNC (which some of our computers need
to use).

At first, I thought it was related to
https://issues.apache.org/jira/browse/GUACAMOLE-414 because, when building
on CentOS 7, I was getting a warning while compiling guacamole-server:

This version of libvncclient lacks support for TLS locking.  VNC connections
that use TLS may experience instability as documented in GUACAMOLE-414

Since I had issues with upgrading libvncclient on CentOS, I tried Ubuntu
18.04, and I don't get that message anymore, but I still cannot get UltraVNC
connections to work when using MS Logon.

Vieri-2, any insight you can provide on your build environment or
configurations you've set in UltraVNC to make this work? For what it's
worth, I've manually specified the username and password in the Guacamole
web interface for VNC, not in LDAP using guacConfigParameter (I can't modify
the LDAP schema).



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