We're running squid-2.6.STABLE21-6 on RHEL5, and are running running into the max number of file descriptors. I have increased it to 64K, but we're still touching the limit.. The server load is not high, but we do have many clients (about 170000 today according to calamaris) that are polling the same slow service often. So, is there any reason not to raise --with-maxfd and max_filedesc ? Are there any upper limits/recommendations for these ? -jf