Isa Server 2006 Dns Error
the more common questions that come up on the www.isaserver.org message boards and mailing list pertains to ISA firewall performance. The common compliant is that the "Internet was fast" before the ISA firewall was installed and then after placing the ISA firewall inline, the "Internet" became "slow". While "fast" and "slow" are relative terms, the point is that it appears to the ISA firewall admin that performance has been adversely affected by the addition of the ISA firewall. Probably the most common reason for poor ISA firewall performance is a DNS related misconfiguration. The best DNS configuration on the ISA firewall is to configure DNS settings on a single interface on the ISA firewall, and that should be an interface closest to an internal DNS server that can resolve Internet host names (typically the internal interface, but it doesn’t have to be). Then you move that interface to the top of your interface list in the Advanced settings in the Network Connections window. Note that this is a simplification, but it will work for 90%+ ISA firewall admins who have an internal DNS server. One thing you should never do is include an IP address of an external DNS server. Because of how the Windows DNS client system works, it is possible that the internal DNS server will be dropped from the DNS list and then you’ll be stuck with only an external DNS server for name resolution and then the ISA firewall won’t be able to resolve internal host names and lose connectivity to the internal AD/DCs. DNS is critical for proper functioning of the ISA firewall. The ISA firewall uses DNS to find the Internal domain controller. It also uses DNS to confirm that an IP address doesn’t match a FQDN that is listed in a URL Set or Domain Name Set that you’ve set in a Deny rule. In addition, ISA Enterprise Edition needs to use DNS to find its own name and if the ISA firewall array can’t resolve its own name, errors will occur in the Firewall service. Poor performance could be due to a DN
(Русский)ישראל (עברית)المملكة العربية السعودية (العربية)ไทย (ไทย)대한민국 (한국어)中华人民共和国 (中文)台灣 (中文)日本 (日本語) HomeProductsLibraryLearnDownloadsSupportForums Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Answered by: Error Code 11002: Host not found isa server 2006 Forefront > Forefront TMG and ISA Server Question 0 Sign in to vote hi i configure my ISA server as a Webproxy but my client resive this error when they want to browse the web Error Code 11002: Host not found Background: This error indicates that the gateway could not find an authoritative DNS server for the website you are trying to access. Date: 4/16/2011 2:02:38 PM http://www.isaserver.org/blogs/shinder/isa-central/dns-related-performance-problems-for-the-isa-firewall-189.html [GMT] Server: isa-server.mau-mio.ir Source: DNS problem another qustion is shall i configure my internal network for webproxy or local host ? and shall i use 80 port or 8080 portDARIUSHk Saturday, April 16, 2011 2:29 PM Reply | Quote Answers 1 Sign in to vote Hi, Thank you for the post. Please also make sure all the clients’ DNS point to the https://social.technet.microsoft.com/Forums/forefront/en-US/1b853ea2-a5db-4ce9-9abd-e6a7790c9b89/error-code-11002-host-not-found-isa-server-2006?forum=Forefrontedgegeneral internal DNS server. And the internal DNS server should use forwarders to point to the ISP’s DNS servers. Then you can create access rule to forward DNS request to ISP. For more information, please refer to this article: http://www.elmajdal.net/ISAServer/Internal_DNS_Forwarding.aspx Regards,Nick Gu - MSFT Marked as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Monday, April 25, 2011 2:44 AM Thursday, April 21, 2011 9:18 AM Reply | Quote Moderator 0 Sign in to vote Hi, the link works for me. If it doesn't work for you, open the root website www.elmajdal.net and search for the article. Create a Firewall policy rule which allows DNS from your internal DNS server to external Open the DNS MMC SnapIn in your internal DNS Server, right click the DNS Server object - navigate to Forwarder and ceate a Forwarder which forwards DNS traffic for external DNS addresses to an external DNS Serverregards Marc Grote aka Jens Baier - www.it-training-grote.de - www.forefront-tmg.de - www.nt-faq.de Marked as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Monday, April 25, 2011 2:44 AM Saturday, April 23, 2011 6:23 AM Reply | Quote All replie
United States Australia United Kingdom Japan Newsletters Forums Resource Library Tech Pro Free Trial Membership Membership My Profile People Subscriptions My stuff Preferences Send a message http://www.techrepublic.com/article/configuring-dns-settings-on-isa-firewall-interfaces/ Log Out TechRepublic Search GO Topics: CXO Cloud Big Data Security Innovation Software Data Centers Networking Startups Tech & Work All Topics Sections: Photos Videos All Writers Newsletters Forums Resource http://www.microsoftnow.com/2009/05/top-12-mistakes-while-configuring-isa.html Library Tech Pro Free Trial Editions: US United States Australia United Kingdom Japan Membership Membership My Profile People Subscriptions My stuff Preferences Send a message Log Out Security Configuring DNS isa server settings on ISA Firewall Interfaces DNS is a vital service to have on your network, but it can be troublesome to implement when you've installed ISA Server 2004. Here's how to get the two working together happily. By Thomas Shinder MCSE | September 12, 2005, 12:00 AM PST RSS Comments Facebook Linkedin Twitter More Email Print Reddit Delicious Digg Pinterest isa server 2006 Stumbleupon Google Plus One of the most persistent problems I've encountered when ISA firewall administrators ask me to troubleshoot their setups is misconfiguration of the IP addressing information on the ISA firewall's interfaces. The two most common configuration errors ISA firewall admins make when configuring the firewall's interfaces are: Assigning multiple default gateways on the firewall Misconfiguring the DNS settings on the firewall The problem of multiple default gateways is easy to recognize and fix. The user with multiple default gateways will see errors in the ISA firewall and Windows event viewer logs and will experience frequent connectivity problems. The fix is as easy as the diagnosis: remove all default gateways except for one, with the remaining gateway typically the one closest to the ISP router. Unfortunately, diagnosing and treating DNS configuration problems isn't always as easy, and it's even more difficult to treat. Why proper DNS settings on the ISA firewall matter Why should you care about configuring proper DNS settings on the ISA firewall? A few reasons getting the correct DNS configuration on the ISA firewall ma
2009. Originally published in August 2007. This article lists some of the common configuration mistakes and gives information on how to avoid them. There is no such thing as a single interface firewall A firewall has a minimum of two network interfaces. This means you need at least *two* NIC cards in your ISA box if you want it to work as a firewall. Theoretically you can run ISA on a box with a single NIC, but that will do little to secure your network. You might just use it as a proxy that your users can connect to the Internet with. Tom Shinder of isaserver.org says: “Deploying a single-NIC ISA Firewall is like giving a soldier a Desert Eagle .50 and no ammo.” In short, you’re not using ISA as a real firewall if you don’t have two interfaces on it! Specify the default gateway on that published server! You need to specify the internal IP address of the ISA server as the default gateway on the server that you want to publish on ISA. Or, make sure that there are appropriate static routes in place. Rules that contradict each other As can be seen from the diagram below, ISA processes your access rules in the order that you specify them, i.e. rule #1 processed first, then 2, 3, etc. If ISA finds that rule #1 is satisfying the conditions required for the access requested by the user, it skips all remaining rules and grants (or denies) access. However, if the condition is not matching for the current rule, it moves on to the next rule and so on. If you happen to place a rule that ‘allows internet access to all users’ BEFORE a rule that ‘denies internet access to Peter’, then Peter will still have internet access. It might look simple but these mistakes happen all the time. IP Addresses The external interface and internal interfaces on the ISA firewall must belong to separate IP ranges. You cannot have internal and external interface IP addresses from the same IP range. IP Spoofing: In case there is an internal router that splits the internal network into two (see diagram above), and ISA Server is in one of these networks, make sure that ranges on either side of the internal router are entered in the Internal network address range on ISA. For example, if you have two internal (protected) networks 192.168.2.0/24 and 10.10.0.0/16 separated by a router, and the ISA is at (say) 10.10.0.4, the Internal range on ISA should ideally include 192.168.2.1-192.168.2.254 as well as 10.10.0.1 to 10.10.255.254. Installing a service on Port