I’ve spent a lot of time trying to configure a RDP connection without using Ignore server certificate = true. The connection always fails.

RDP Failed

I have a Windows Server 2022 with a certificate issued by my PKI and I installed the CA root certificate in $HOME/.freerdp/certs directory but nothing works. Do I miss a step ?

systemctl status guacd :

guacd[9091]: Resize method: none
guacd[9091]: No clipboard line-ending normalization specified. Defaulting to preserving the format of all line endings.
guacd[9091]: User "@c28ba2ca-53a8-420f-8259-2950f6344169" joined connection "$b552c27f-b754-440b-8a96-f7e16aa5d994" (1 users now present)
guacd[9091]: Loading keymap "base"
guacd[9091]: Loading keymap "en-us-qwerty"
guacd[9091]: Certificate validation failed
guacd[9091]: RDP server closed/refused connection: SSL/TLS connection failed (untrusted/self-signed certificate?)
guacd[9091]: User "@c28ba2ca-53a8-420f-8259-2950f6344169" disconnected (0 users remain)
guacd[9091]: Last user of connection "$b552c27f-b754-440b-8a96-f7e16aa5d994" disconnected
guacd[902]: Connection "$b552c27f-b754-440b-8a96-f7e16aa5d994" removed.

I tried to write in know_host2 manually and it works however not really an option since I would have to do it for all the machines…

Does someone have ever been able to get it working ? I searched for hours on the Internet, but no one talked about a solution other than ignoring server certificate.

Versions :
FreeRDP2-dev
Guacamole 1.5.5