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  • Blog Post: Fun with ISA Server and AES Cipher Suites

    What is “AES”? “AES” stands for “Advanced Encryption Standard”; a symmetric encryption algorithm used in several encryption schemes, such as FIPS-197 . http://csrc.nist.gov/archive/aes/index.html provides links to detailed discussions of AES. 1. Netaction Encryption Guide article 2. NIST FIPS...
  • Blog Post: ISA & TMG NAT behavior And MS08-037

    Introduction Microsoft Security Response Center (MSRC) issued bulletin MS08-037 to address vulnerabilities in DNS resolvers caused by predictable UDP source port usage. MSKB 956190 addresses behavior observed when traffic crosses a NAT-based firewall and provides workarounds to mitigate this behavior...
  • Blog Post: ISA Firewall Service Process (wspsrv.exe) high CPU utilization issue

    1. Introduction   When dealing with ISA high CPU utilization where wspsrve.exe is the one consuming more resources, the first impression is that ISA is the culprit for that. There are some scenarios where this statement is true, such as this one that I documented last year. But there are other scenarios...
  • Blog Post: Introducing Forefront Network Inspection System (NIS) in TMG Beta 3 release

    You may have had the opportunity to experiment with NIS when it was first released with TMG Beta 2 and ich provies preliminary insights into the new technology provided technology preview of the new Network Inspection System. NIS is a protocol decode-based traffic inspection system that uses signatures...
  • Blog Post: Office Web Components Advisory, ISA Server and Forefront TMG

    Hello Community: I would like to clarify some points for you regarding the security advisory that was released on 13 July. Microsoft Security Advisory 937432 provides information about a vulnerability in Office Web Components (OWC) and links to a mechanism to help mitigate this vulnerability. As many...
  • Blog Post: RRAS Ports are not created after enabling VPN on ISA Server 2006

    1. Introduction This post is about an issue that was causing VPN Clients not being able to establish a VPN connection with ISA Server 2006. 2. Symptoms When testing the VPN Client access in this particular scenario we could see on ISA Server Logging that the system rule that allows VPN Client access...
  • Blog Post: Publishing Microsoft CRM 4.0 through ISA Server 2006

    1. Introduction Last February I collaborated with Henning Petersen from the CRM Team on CRM 3 through ISA Server 2006 . After this post, we received a lot of requests for an article on publishing CRM 4 using the Internet Facing Deployment option (IFD). This post is going to answer those requests...
  • Blog Post: Caching Comments from Yahoo's Mark Nottingham

    I recently had the good fortune to collaborate with Mark Nottingham from Yahoo regarding some caching problems for some of their pages. Mark has written a fine summation of the problem and offers a functional solution (gotta love those functional solutions) for scenarios where a proxy is caching something...
  • Blog Post: Configuring Network Inspection System (NIS)

    Network Inspection System (NIS) , the vulnerability signature component of TMG Intrusion Prevention System (IPS), comes with a pre-defined recommended policy out of the box – this is the recommended configuration for NIS . Nevertheless, NIS supports granular control and policy configuration to comply...
  • Blog Post: IPSec Domain Isolation Using ISA Server Updated and Reposted

    The IPsec Domain Isolation article that was originally announced here has been rewritten and reposted here . Feel free to comment and critique. Jim Harrison PM, FF Edge CS
  • Blog Post: ISA Integrated NLB - Multicast with IGMP… ISA “blocks” IGMP packets

    Introduction After configuring ISA Integrated NLB to use multicast with IGMP, you may see blocked IGMP packets between your ISA array members. The ISA nodes don't need these packets to work properly, and it's ok when they are blocked by the Firewall Engine. As many customers are using Multicast...
  • Blog Post: Understanding By-Design Behavior of ISA Server 2006: Buffering and Streaming Web Publishing Rule Content

    Introduction There are some customer issues that are caused because of ISA Server design or standard behavior that is not clearly understood. This article describes by-design behavior that occurs when you are using a Web publishing rule to serve content to external clients. By-design behavior...
  • Blog Post: Publishing Microsoft CRM 3.0 through ISA Server 2006

    1. Introduction One of our recent cross team collaboration experiences was with the CRM Team (Microsoft Dynamics). We were collaborating with them to make the CRM interface securely available through Internet users. We narrowed down two main scenarios where ISA Server 2006 could be used to...
  • Blog Post: Users Receive an error 64 when Browse a Web Site Published through ISA Sever 2006

    1. Introduction This post is based on a very interesting issue where an ISA Admin was publishing an internal Web Server that was working internally just fine for a while. Internally the web server was listening on port 82 and therefore the bridging configuration on the Web Publishing rule was correctly...
  • Blog Post: More KCD fun for ISA Server 2006

    (content to follow)
  • Blog Post: ISABPA V5 has been released

    The ISA Server Team is excited to announce the version 5.0 release of the Microsoft© ISA Server Best Practices Analyzer Tool (IsaBPA V5). New in Version 5 of IsaBPA: ü ISA Data Packager (IDP) GUI – The IDP collects all information needed for troubleshooting with a single click. For this version...
  • Blog Post: ISA CSS and Arrays in a Nutshell

    There still seems to be some confusion about what an ISA Array is. I still see some very basic questions about ISA arrays and the CSS. First, ISA arrays have been around since ISA 2000 Enterprise Edition but the CSS was new with ISA 2004 Enterprise Edition. The Configuration Storage Server is where...
  • Blog Post: Mainstream Support Ending for ISA Server 2004 Standard Edition SP3

    This is just a reminder, that mainstream support for ISA 2004 Standard Edition SP3 is going to end next week (October 13 th , 2009). That means that starting Oct 13 th , the Forefront Edge product team will not issue non-security hotfixes, and will not accept any DCRs for ISA Server 2004 Standard...
  • Blog Post: ISA Policy Storage 101

    Introduction ISA Server Enterprise and Standard Editions use different locations for the persistent policy store, but there is only one functional location for ISA Policy; in each local ISA server’s registry and file system. Since the registry limits maximum hive size, and because ISA policies can...
  • Blog Post: ISA Server 2006 Service Pack 1 Features

    ISA Server 2006 Service Pack 1 Features Introduction Microsoft ® Internet Security and Acceleration (ISA) Server 2006 Service Pack (SP) 1 will be available for your installation pleasure this summer! This Service Pack introduces new features and improved functionality for ISA Server 2006 Enterprise...
  • Blog Post: Time Matters - When ISA Server is affected by Windows Time settings

    1. Introduction As the title of this post suggests, this is all about time and keeping systems in sync. Many administrators think that time just matters if Kerberos is somehow involved in the deployment, which is not true. This post will describe two scenarios where ISA Server was having problems...
  • Blog Post: TMG 2010 – FBA, troubleshooting the change password feature

    When we are publishing OWA, or every web service through TMG and we are willing to make use of FBA we have the chance to change our password through the FBA web form. However this step is not always as straightforward as it seems and there are some possible pitfalls in the configuration on the TMG or...
  • Blog Post: How to Allow HTTP 301 through ISA Server 2006

    Introduction When you publish a web site through ISA Server 2006, you can configure the action to take for requests that match that rule to deny (see Figure 1) and redirect the user for another URL. What is happening behind the scenes is that ISA Server 2006 sends an HTTP 302 redirect to the client...
  • Blog Post: WPAD for ISA Server and Windows Media Proxy Server

    Introduction Since the release of Windows Server 2008 Streaming Media Services , many ISA admins have wondered how they could combine the two to control the routing of streaming content for their users. There are generally two goals for this configuration: 1. limit streaming content to approved...
  • Blog Post: Unable to Change Password through ISA Server 2006

    Before we go through this specific scenario it is important to remember some good references on how to troubleshoot issues related to change password feature on ISA Server: 1. The "change password" feature does not work as expected after you install ISA Server 2006 Service Pack 1 http://support...