Am 11.11.2008 um 20:22 schrieb Gideon Simpson:

Xlib: connection to "localhost:15.0" refused by server Xlib: Invalid MIT-MAGIC-COOKIE-1 key emacs: Cannot connect to X server localhost:15.0. Check the DISPLAY environment variable or use `-d'. Also use the `xhost' program to verify that it is set to permit connections from your machine.

This also happens on Tiger, 10.4.11. This feature was introduced some time ago with some update I don't remember exactly. Since Apple support folks tell me since a long time to migrate to Leopard to get my reported bugs fixed I never made a bug report. I think putting my Mac to sleep is not sufficient to trigger this feature, the re-use of X11 has to happen at least next day, i.e., date of launch time and date of use time have to be different by at least one day. I don't remember what problems I had then and what I tried to solve it. My work-around since then is to copy my ~/.Xauthority file into root's home directory. Next day I can invoke xhost as root and I have access again – until I need to launch X again. -- Greetings Pete Hard Disk, n.: A device that allows users to delete vast quantities of data with simple mnemonic commands.