Hi! I've been experiencing the same troubles as you do. Debugging the issue using line-by-line merges from a previous (working) cupsd.conf I found out that the error is caused by the following line:
Listen /var/run/cups/cups.sock Comment it out and xpp starts working again. I'm not sure whether this is a bug xpp or in cupsys, bug similar problems are documented in #375907. Regards, Michael
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