Daryl Borth created GUACAMOLE-262:
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Summary: VNC connection fails if true color flag is set to 255
Key: GUACAMOLE-262
URL: https://issues.apache.org/jira/browse/GUACAMOLE-262
Project: Guacamole
Issue Type: Improvement
Components: VNC
Reporter: Daryl Borth
Priority: Minor
I was having trouble getting Guacamole to connect to ESX 6.5's VNC server. The
issue is reported here - https://github.com/LibVNC/libvncserver/issues/141
Using TightVNC, TigerVNC, UltraVNC, and Chicken of the VNC the connection
worked fine - only Guacamole failed. After some Wireshark sleuthing I found
that libvncserver's client by default sets the trueColour flag to TRUE (which
is -1 which is 255), whereas all of the other clients listed above set this
flag to 1. Although the spec is vague - it says non-zero is "true" - I would
suggest setting this flag to 1 to maximize compatibility:
rfbBool set_pixel_format(rfbClient* client) {
client->format.trueColour = 1;
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