I installed the latest version of x2go from the official webpage. Putted the dmg into the application folder and opened the application. I entered the information from the connection, they are correct, I double checked them and I'm able to connect through ssh with that same information. But this message keeps poppiong up after clicking yes every single time.
Which read in spanish 'This sever is unknown, trust its key? Hash of its public key:'
Which is a common message for a x2go connection. I click yes every time but it pops up again and again until I click no, then the a new dialog tells that the connection failed.
I checked the xquartz installation, it's the version 2.8.2.
Disconnected audio, printing etc...
I solved this while I was writing the question so I might as well leave the answer here since I didn't find the solution for this problem anywhere else.
Starting to investigate it here:
https://serverfault.com/questions/487597/able-to-connect-by-ssh-but-not-x2go
The author talks about how to add a key manually into the folder ~/.ssh
While trying to access it by terminal it yielded the following prompt
Trying to acces it I stumble across this thread
https://unix.stackexchange.com/questions/146193/bash-cd-ssh-permission-denied
Just inputting this
Was enough for x2go to work, it couldnt access the folder in the first place
PS: This solution allows x2go to work correctly, but makes ssh connection on the terminal unable to work. To return to the terminal settings one should do
From one of the comments of this thread
https://unix.stackexchange.com/questions/494483/specifying-an-identityfile-with-ssh