16 août 2013

Part 1: Reverse Proxy for Exchange Server 2013 using IIS ARR

For a long time, ForeFront TMG (and ISA before it) has been the go-to Microsoft reverse proxy solution for many applications, including Exchange Server. However, with no more development roadmap for TMG 2010 a lot of customers are looking out for an alternative solution that works well with Exchange Server 2013. The Windows team have added an additional component called Application Request Routing (ARR, or as Greg the pirate says, ARR!) 2.5 to the Internet Information Service (IIS) role, which enables IIS to handle reverse proxy... [Lire la suite]
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27 octobre 2011

Use the Power of Excel Pivot Tables to analyze attacks and session distribution

Usually we’re using tools like Network Monitor, various text file parser, Procmon, Windbg… to solve ISA/TMG cases every day in and out in Microsoft Customer Service & Support. Sometimes we also use Excel to be able to filter the exported Firewall or Web Proxy Logs our customers send to us, e.g. only display traffic for a specific Client IP or for a specific rule. Some time ago I realized that there’s another quite powerful feature of Excel, which I didn’t connect with analyzing network traffic before, but more with things like... [Lire la suite]
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26 janvier 2011

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 where this is not true, including scenarios where wspsrv.exe is crashing – not always is because of ISA itself. I tried to demystify this on this post that I wrote back in 2009. This post is about a scenario where ISA... [Lire la suite]
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24 janvier 2011

Random authentication prompts while accessing internet through ISA Server followed by ISA Server becoming unresponsive

Introduction Consider a scenario where users behind ISA Server (internal network) start to receive random prompts for authentication while trying to access internet using ISA Server as proxy. The authentication prompt persists even after entering the credentials. To resolve the issue it is necessary to restart Firewall Service. Although you probably heard or read about this scenario many times, the goal of this post is to give you a compiled version of the action plan and what to look for while analyzing the data. Data... [Lire la suite]
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04 janvier 2011

New rollups released for TMG 2010 and ISA 2006

We would like to inform you that we have released two new rollups. Forefront Threat Management Gateway (TMG) 2010 Service Pack 1 We have released Software Update 1 Rollup 2. More information about the rollup is available in the following KB article- http://support.microsoft.com/kb/2475183 ISA Server 2006 SP1 Hotfix Package We have released a Hotfix a Hotfix Package for ISA Server 2006 SP1. More information is available in the following KB article - http://support.microsoft.com/kb/2475184 Availability ... [Lire la suite]
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21 novembre 2010

Case sensitivity of ISA/TMG generated proxy auto configuration (pac) files

Scenario From time to time we come across cases where customers complain that the proxy exception list does not work for certain URLs and (Winhttp) clients still try to connect to the destination server using the proxy instead of going directly. Affected applications vary, we have seen issues with outlook 2007, SCCM, but the list might not be limited to those two – any Winhttp application might show the same symptoms. Upon investigating these issues we found that the problem is a case-sensitivity issue – applications might... [Lire la suite]
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02 novembre 2010

Outlook Anywhere and ActiveSync Http Filter Configuration

Here are the ISA Server/Forefront TMG HTTP Policy settings I use for ECP, OAB and Autodiscover. These settings were tested with Outlook 2007/2010 and Exchange 2007. Setting and rule *Exchange ActiveSync *RPC over http (Outlook 2003/2007) General tab Maximum headers length 32768 32768 Maximum payload length 10485760 (10 MB) Any Maximum URL length 1024 16384 Maximum query length 512 4096 Verify normalization Yes Yes Block high bit characters Yes Yes ... [Lire la suite]
03 septembre 2010

Update Center for Microsoft Forefront and Related Technologies

Have you ever wondered what is the latest public hotfix or update available for ISA, IAG, TMG or UAG? Good news!!!!!!!!!!!!!! We have launched the Update Center for Microsoft Forefront and Related Technologies where you can now go and check for the latest updates related to any forefront product. The site is located at http://technet.microsoft.com/en-us/forefront/ff899332.aspx and will give you information such as Product Version, Latest Service Pack, Latest Cumulative Update and General Guidance for all forefront technologies. ... [Lire la suite]
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12 février 2010

Using Forefront TMG/ISA Server BPA for documenting your deployment

An administrator of Forefront TMG or ISA Server may want to document their current configuration, so that they can: Recreate the Forefront TMG/ISA Server setup from the documentation in the case of data loss/corruption. Share the documentation with other people, so that they can understand what settings are used (e.g. in the case of a deployment handover). This document describes how Best Practices Analyzer (BPA) can be used to automatically document the configuration. Forefront TMG/ISA Server BPA There are 2... [Lire la suite]
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26 janvier 2010

Un Best Practice Analyzer disponible pour FTMG 2010 (tmgBPA)

Voici un outil bien pratique pour tous ceux qui ont déployé Forefront Threat Management Gateway 2010 (FTMG) dans leur infrastructure et qui veulent vérifier l’état de santé générale. Anciennement disponible pour son prédécesseur ISA, voici la nouvelle version 8 destinée à FTMG 2010. Grâce à ce Best Practice Analyzer vous pouvez analyser votre serveur FTMG 2010, vérifier la configuration local et effectuer des rapports afin d’identifier d’éventuels problèmes. L’outil va automatiquement se baser sur les données collectées en local... [Lire la suite]