Hi @OlivierP,
Is there any chance you have changed the SSCP connection username and/or password? Aside from the message "capabilities parsing failed" you should see a message containing "wrong username or password?". If so then you can fix this by replacing the image with the stock one.
If this is not the case, then it would be helpful if you could provide us with some more information, specifically the IDE version, image name and version, and the response for the command "sudo cat /proc/cpuinfo"