Hi, I have a fc4 and a fc5 systems: fc4: 2.6.16-1.2096_FC4, httpd-2.0.54-10.3, php-5.0.4-10.5 fc5: 2.6.18-1.2239.fc5smp, httpd-2.2.2-1.0, php-5.1.4-1 This early morning, the httpd in both systems suddenly failed. When I try this in the fc5 system: # /etc/init.d/httpd restart it shows: Stopping httpd: [ FAIL ] Starting httpd: [ OK ] I immediately run this command again, it still shows Stopping httpd: [ FAIL ] Starting httpd: [ OK ] that means that httpd started and immediately stopped. I didn't run this in fc4 system because I had to reboot it to see if it can come back. I reboot them, they are normally running now. The only information that might be useful in fc4 system is in httpd/error_log: PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 79 bytes) in /usr/share/squirrelmail/functions/imap_general.php on line 245, referer: http://morpheus.wustl.edu/webmail/src/read_body.php?mailbox=INBOX&passed_id=10374&startMessage=1 but it was logged yesterday afternoon and at that time, its httpd was running. In fc5 system the httpd/error_log shows: [Thu Dec 14 08:11:45 2006] [warn] pid file /etc/httpd/run/httpd.pid overwritten -- Unclean shutdown of previous Apache run? [Thu Dec 14 08:11:45 2006] [emerg] (28)No space left on device: Couldn't create accept lock (/etc/httpd/logs/accept.lock.10117) (5) The "apparant behavior" is the same in both system: httpd could not run. Can somebody tell me what might cause this kind of problem? and where I should check to find more information to fix it? Thanks! Hongwei Li