With Squid 2.7 Stable 3 I'm getting this warning in cache.log: Your cache is running out of filedescriptors File descriptors are 1024 infact when squid starts, it says: Starting Squid Cache version 2.7.STABLE3 for i386-debian-linux-gnu... 2010/03/04 12:53:24| Process ID xxx 2010/03/04 12:53:24| With 1024 file descriptors available