Found out the problem: (see http://forum.ubuntuusers.de/topic/lighttpd-reload-loescht-fcgi-socket/) /etc/logrotate.d/lighttpd
lighttpd is reloaded in there I think new lighttpd process are created while the old are still running, as soon as the old process get be killed, the fast-cgi socket will be deleted too. Workaround: replaced reload with restart in the logrotate script works fine -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

