Hey hozawa,Thanks Thanks for your answer. I tried it serveral times, and restartet the server and firefox. Stopped the services and processes so that really nothing was running anymore. Restartet everything, but didn't find it. I also read online to copy it into the folder you mentioned, but didn't work out as well :/ Next try was to add it to C:Jaspersoftjasperreports-server-cp-6.1.0buildomaticconf_sourcedb as i read in a forum. Nothing as well :/ I'm running out of ideas right now. There are lib folders in the sub-folder "java" in "JasperSoft", maybe put it there? Unfortunately I can't find the thread anymore which suggested "copy the driver file to the locale file system where the browser runs". Any idea ? Thanks ;)