VNC display not clear

[Stephan]

Hello,

 

I'm using Guacamole version 1.2.0 on CentOS 7.8 (with Nginx) but this problem was already present on previous versions.

RDP connections work fine but I am unable to get a "clean" display result with VNC (see image) using Guacamole.
On the other hand, if I use a "classic" VNC client, the display is correct.

 

I connect with VNC on Windows servers (2008R2/2012/2016) and the result is the same. I have tried several software (UltraVNC/TigerVNC/RealVNC) without success.

 

Do you have any idea to solve this problem?

 

UltraVNC : 

https://ibb.co/m0V67SW

 

Guacamole :

https://ibb.co/qBPtv2p

 

Thank you

 

Stéphan

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