Hello All, I am running Squid Cache: Version 2.6.STABLE12 configure options: '--prefix=/usr/squid' '--exec-prefix=/usr/squid' '--sysconfdir=/usr/squid/etc' '--enable-snmp' '--enable-err-languages=English' '--enable-underscores' '--enable-linux-netfilter' '--enable-storeio=ufs,aufs,coss' '--with-pthreads' '--enable-coss-aio-ops' '--with-aufs-threads=24' '--enable-linux-tproxy' '--enable-removal-policies=lru,heap' '--enable-internal-dns' '--with-maxfd=65535' '--enable-allowdot' The cache is at ~500req/s load. I need to bind the outgoing data to a particular interface so I have added the following code in comm_connect_addr //Bind outgoing connections except those going internally if ( Config.bind_iface && (address->sin_addr.s_addr != local_addr.s_addr) ) { strncpy(interface.ifr_ifrn.ifrn_name, Config.bind_iface, 8); enter_suid(); setsock_err = setsockopt (sock, SOL_SOCKET, SO_BINDTODEVICE, (char *)&interface, sizeof(interface)); leave_suid(); if(setsock_err < 0) { debug(5, 1) ("comm_connect_addr FD %d: %s\n", sock, xstrerror()); } } errno = 0; The problem we are having is that as soon as this is on, there are a lot of these messages. (I have just the uid, errflag and fd values to the output) 2008/10/10 18:08:55| storeAufsOpenDone: (1) Operation not permitted: uid 1002 errflag 1 fd -1 2008/10/10 18:08:55| /var/cache/squid/03/F8/0013F823 2008/10/10 18:08:55| storeAufsOpenDone: (13) Permission denied: uid 1002 errflag 13 fd -1 2008/10/10 18:08:55| /var/cache/squid/09/3F/00193F5D 2008/10/10 18:08:55| storeSwapOutFileClosed: dirno 0, swapfile 00193F5D, errflag=-1 (13) Permission denied 2008/10/10 18:08:55| storeAufsOpenDone: (13) Permission denied: uid 1002 errflag 13 fd -1 2008/10/10 18:08:55| /var/cache/squid/09/3F/00193F6F Any ideas why this could be happening and how I could solve it ? Is is related to threading ? Also, adding debug_options 5,0 seems to stop those messages. And interestingly debug_options 79,0 doesnt stop these messages. Let me know if you need any other information. Thanks for your time and I would appreciate any help. -- Pranav