About Squid reverse proxy (+ pfsense?) and bottlenecks (max number of connections, etc.)

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http://serverfault.com – We are having problems with our Squid servers during traffic peaks. We had problems in the past and we got different error such as "Your cache is running out of filedescriptors", syncookies errors, etc. but nowadays we have optimized that and we are not getting those errors anymore. The problem is that the servers, which many of them are different in resources and in two different datacenters (which are all running squid as a reverse proxy caching contents from several webservers in other datacenters), during big traffic peaks all of them fail to deliver content (html pages, js files and css f (HowTos)