AFAIK npapi plugin support has been removed in Firefox 52 so the x2go plugin will not work anymore. Uli Vom Smartphone gesendet. ----- Ursprüngliche Nachricht ----- Von: "Justin St. Marie" Gesendet: ‎08.‎05.‎2017 17:33 An: "submit@bugs.x2go.org" Betreff: [X2Go-Dev] Bug#1170: x2goplugin / x2goplugin-provider Failed toconnect: Permission denied Package: x2goserver Version: 4.0.1.20-1.el7.x86_64 Package: x2goplugin-provider Version: 4.1.0.0-1.el7.x86_64 Package: x2goplugin Version: 4.1.0.0-1.el7.x86_64 All packages are from the official EPEL 7 repository. When trying to log in using the firefox plugin, the error is: Failed to connect: Permission denied. The same credentials work with the x2go client. I used the example X2Go Demo config file, only changing server=IPaddress.