Hi, Squid generates the following warning on cache.log file: WARNING! your cache is running out of filedescriptors. I know that there is no available FD for squid but I couldn't solve it yet. I have tried the methods mentioned in squid archive to increase FD number but nothing changed. I have added ; * soft nofile 8192 * hard nofile 65535 lines into the /etc/security/limits.conf file then I have issued "ulimit -HSn 8192" to increase the per process file descriptor limit but squid still says that there is 1024 file descriptor available at startup. Concurrent connections vary between 1000 and 3500 . Machine is an SMP system with two 3.2GHZ Xeon , 4GB RAM and scsi raid but its response is really low under 2000 concurrent connection. Currently I dont have any chance to re-compile squid. This FD problem may cause this slow response time right? What do you recommend to me in this case? Any help is appreciated. Regards.