am using centos5 red hat as both email and internet server.at one time i wanted to edit the squid.conf file intending to add other bad sites to the file but after that squid failed to start. i then copied the squid.conf file from the other server which serves as back up but now when i type service squid status i get the error "squid dead but pid file exist. could not send signal 0 to process 2401, (3) no such process.

please help urgently.
nocare

Greetingz & Welcome to LQ!

Try removing the PID file first. I think they live in /var somwehere
P.S: There's no 'urgent' when asking volunteers.

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Applications failing to start after a modification is made to a configuration file is a common occurrence, even for those who have been using Linux for many years and usually indicates an error in the configuration file. The error can be something as simple as a misspelling, incorrect punctuation, or even an unknown keyword caused by a version incompatibility. When this sort of thing happens, one of the first things you should do is check your log files, and with Centos, /var/log/messages would be a good place to start. More often than not, the log file will show you exactly what you did wrong, even pointing you to the line and word that is problematic.