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[SOLVED] Hi Guys , Some times back I have faced some problem in one my squid proxy server. My squid service was killed and was failed to start the service.  # service squid start Starting squid: ....................                       [FAILED] There was no visible error on that screen. It simply returned the status is failed. Then I check the log file of system. There was an error " exited due to signal 25 ". Jul 27 12:48:46 PRXY squid[14372]: Squid Parent: child process 14375 started Jul 27 12:48:46 PRXY squid[14372]: Squid Parent: child process 14375 exited due to signal 25 Jul 27 12:48:49 PRXY squid[14372]: Squid Parent: child process 14381 started Jul 27 12:48:50 PRXY squid[14372]: Squid Parent: child process 14381 exited due to signal 25 Jul 27 12:48:53 PRXY squid[14372]: Squid Parent: child process 14387 started Jul 27 12:48:53 PRXY squid[143...

  stop squid, and erase all the files from your cache directory  For example: squid -k shutdown or /etc/init.d/squid  stop Find-out which is you squid cache Directory using following command # more /etc/squid/squid.conf | grep ^cache_dir cache_dir ufs /var/spool/squid 5120 16 256   Here it is showing /var/spool/squid. Then remove cache files ( Take a backup before deleting if required)  rm -fr  /var/spool/squid/*   then re-create the swap directory structure: squid -z  now start squid again. /etc/init.d/squid  start