1 - If DNS ain't happy, ain't nobody happy..... (Or replace with your girlfriend/wife/mother/sister/PHB/kids/.....) 2 - More work, runs slower, get more ram and cpu cycles to help with peak load if you need it. 3 - More rules, runs slower, get more ram and cpu cycles to help with peak load or trim your rules down. -----Original Message----- From: Ball, Dan [mailto:DBall@xxxxxxxxxxx] Sent: Monday, February 07, 2005 9:21 AM To: [ISAserver.org Discussion List] Subject: [isalist] ISA Server Slowdowns... http://www.ISAserver.org For those of you who have experienced the massive slowdowns that ISA2004 has occasionally, I just recently closed out a case with Microsoft about this. Our problem was most likely due to having multiple DNS settings, once I removed all entries but the ones to our internal DNS server, we haven't experienced a massive slowdown since. Here are some of the major causes, as listed by the ISA Development/Testing crew: ---------- 1 - DNS lookup failures. The longer it takes ISA to resolve a name, or if a lookup fails, the longer it takes to allow / deny the request 2 - Plug-in behavior - if (as in the case of SurfControl), it adds a LOT of domains / content validation points, this can slow ISA to a crawl 3 - ISA policies. The more rules you create and the more complex the rule criteria, the longer it takes for ISA to evaluate them. Generally, you should use as few rules as possible and arrange them thus: - Anonymous Deny - Anonymous Allow - Authenticated Deny - Authenticated Allow ---------- Just thought I'd pass this on in case it helps anyone else... ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: tradtke@xxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx