X11 strikes back – MIT-MAGIC-COOKIE-1 data did not match

Oh no! Today I again experienced this weird X11 error: when I try to launch a GUI from a Linux CLI, instead of a beautiful (actually not) window I saw this error message: Xlib: connection to “localhost:10.0” refused by server Xlib: PuTTY X11 proxy: MIT-MAGIC-COOKIE-1 data did not match Error: Can’t open display: localhost:10 Well, … Read more