Here's what I get from mgr:info File descriptor usage for squid: Maximum number of file descriptors: 1024 Largest file desc currently in use: 755 Number of file desc currently in use: 692 Files queued for open: 0 Available number of file descriptors: 332 Reserved number of file descriptors: 100 Store Disk files open: 0 and here's the squid -v output Squid Cache: Version 3.2.1 configure options: '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' '--enable-inline' '--enable-async-io=8' '--enable-storeio=ufs,aufs' '--enable-removal-policies=lru,heap' '--enable-cache-digests' '--enable-underscores' '--enable-follow-x-forwarded-for' '--disable-translation' '--with-filedescriptors=65536' '--with-default-user=proxy' '--enable-ssl' '--enable-ltdl-convenience' How can I get squid 3.2.1 to use more than 1024 ? I've verified that system is fine, there's no per user limit either. # cat /proc/sys/fs/file-max 199839