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Yuri Diogenes's Blog

Thoughts from a Senior Content Developer @ Microsoft Data Center, Devices & Enterprise Client – CSI (Enterprise Mobility Team)

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  • Blog Post: ISA Server Firewall Service crashed…but why?

    1. Introduction When question that I always receive when working with Firewall Service crashing is: why is it crashing? When the answer is: due a third party application…then the next question is: how is that? I thought each process was running independently and one couldn’t crash the other, right...
  • Blog Post: The Imminent Issue of Certificates in ISA Server 2006

    My experience dealing with ISA Server cases on the daily basis showed me that Certificates are a delicate subject. Is the type of thing that it’s initially simple, but when it expires it can be a pain and can bring your ISA Server down if you don’t plan ahead the renew process. In this economical...
  • Blog Post: Error 58 “The specified server cannot perform the requested operation” while while performing LDAP authentication through ISA Server 2006

    1. Introduction This post is about a scenario where users were not able to authenticate on a FBA page published by ISA Server using LDAP as authentication repository. The error message that was showing up there was: Figure 1 – Unable to authenticate. Although it says to double check...
  • Blog Post: Another case where Firewall service (Wspsrv.exe) was crashing

    Here it come another post about Firewall Service crashing and again the best approach to catch this crash was to attach a debugger to the firewall service (see this article to know how to do this). Result was quiet interesting because at this time there was no third party involved. After some research...
  • Blog Post: The Case of Eternal Loop while Publishing OWA through ISA Server 2006

    1. Introduction This post is about a very interesting case that I worked this week, the initial scenario was: · ISA Server 2004 Publishing OWA · FBA Enabled on Exchange Server · ISA Server using RSASecurID as authentication on the Web Listener On this particular scenario we were...
  • Blog Post: Clients can’t browse Internet through ISA because ISA is waiting for the DNS to answer

    Just a quick follow up on the article that I wrote for the ISA Team Blog about ISA stopping answering requests . Last week I was collaborating with Networking Team in another case where ISA was stopping answering because of delays in DNS response. They fixed the DNS issue by changing the registry keys...
  • Blog Post: Troubleshooting LDAPs Authentication through ISA Server 2006

    We just published a new article at Tales from the Edge Community Site that describes how to troubleshooting LDAPs authentication through ISA Server 2006. Check it out at: http://technet.microsoft.com/en-us/library/dd316279.aspx
  • Blog Post: ISA Server 2006 SP1 is on the way to make this summer even hotter

    The expected ISA Server 2006 SP1 is on the way, Jim Harrison has blogged in the ISA Team Blog about the new features of this release. The ISA Server community is very excited about this announcement as externally by Tom Shinder on his blog . I just delivered a webcast to the IT community in Brazil...
  • Blog Post: The Network Design that could bring you down

    1. Introduction Recently I worked in a case where the ISA Server was not used only as an edge firewall but also as main concentrator of “ALL” network traffic. While this could really sound nice in terms of central management and security awareness of the traffic this also imposes other...
  • Blog Post: Cross-site scripting (XSS) Vulnerability in OWA

    Last July 8th Microsoft released the security update MS08-039 for OWA, the following Exchange versions are affected: Software Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update Microsoft Exchange Server 2003 Service Pack...
  • Blog Post: Error 64 - From the Field to the Classroom

    This week I’m delivering an ISA Server 2006 Workshop to Microsoft Premier Customers. While the training is going really well one thing that I notice was the following common question from students in the class: why sometimes I can’t access a website while I’m behind ISA and if I bypass ISA it works?...
  • Blog Post: ISA Server 2006 Publishing Issue with MOSS 2007

    " Troubleshooting Sharepoint/MOSS 2007 publishing through ISA Server can be really challenging, mainly because most of the times the argument is: but it works just fine internally . Although this can be a good argument it doesn’t prove that the issue is on ISA Sever. .." Check it out the complete...
  • Blog Post: Another fun with Change Password feature through ISA Server 2006

    1. Introduction When we think that we had covered all scenarios to mitigate possible issues with change password feature through ISA Server 2006 something new happen. This quick post is about a scenario where only users that belong to a specific OU were unable to change password through ISA Server...
  • Blog Post: The Network Design that could bring you down – The Complement

    It is always good to listen, step back and let someone else look to the big picture to see if can see what you can’t see. A friend of mine (Jim Harrison) once told me: review that for me, I’m too close to the forest to see the monkeys throwing poop at me . I'm saying that now because I just posted the...
  • Blog Post: Unable to Install ISA BPA

    Today while troubleshooting in ISA Server issue I had to install ISABPA in order to get an ISA Data Packager in repro mode. When the admin was trying to install ISABPA we got the following error: The user that was trying to execute this setup was the local admin of the ISA Box, no software...
  • Blog Post: Why /3GB can negatively affect your ISA Server

    1. Introduction While many Microsoft Application Servers such as Exchange take full advantage of /3GB switch in boot.ini, ISA Server can be seriously affected if you use this switch on it. Before we discuss what this switch does and how can affect ISA Server I strongly recommend you to read this...
  • Blog Post: This is not an ISA Question

    ISA is an application that sits on the top of the Windows OS and consumes many OS features and functionalities. Many administrators still confused about what it is and what it is not an ISA related issue. I decided to enumerate the top five common questions (or misconceptions if you will) about ISA in...
  • Blog Post: ISA Server Losing Secure Channel with the DC - The 5783 Nightmare

    The first time that I blogged about this was in October 2006 at ISA Server Team Blog , we were getting so hammered about that issue that it motivates us to create an official article about that. Last year we published an article at Microsoft TechNet Library explaining how to improve Web Browsing performance...
  • Blog Post: Error 500 while trying to access some parts of the CRM 4 Web Site Published through ISA Server 2006

    This short post is about an issue that I worked a couple of weeks ago about publishing CRM through ISA Server. The admin had followed the post that I wrote on how to publish CRM through ISA Server 2006 and most of the things within CRM web sites were working fine. The problem is was externalized when...
  • Blog Post: The Firewall Madness

    This week I worked in an issue where ISA Server 2006 was stopping answering request and NLB on ISA Server was constantly appearing with the status for “Unavailable”. The odd thing about this scenario was that every time that the firewall admin changed a rule in one node and forces a synchronization the...
  • Blog Post: Antivirus and ISA Server

    1. Introduction This post is about a support call where customer was complaining that the ISA Server was stop answering requests every five days in average. Of course this is too broad statement and we have to narrow it down with more and more questions. The interrogatory started: · When you...
  • Blog Post: MS April 2009 Security Bulletin has a Security Update for ISA and TMG

    Today we are releasing the April 2009 Security Bulletin and this month we have a security update for ISA and TMG for a vulnerability that can cause Denial of Service. You can read more about this update on the ISA/TMG perspective reading the bulletin MS09-016: http://www.microsoft.com/technet/security...
  • Blog Post: Understanding ISA Server Policy Store Registry Hives

    How many times were you wonder what the difference between HKEY_LOCAL_MACHINE\IsaStg_Eff1 and \IsaStg_Eff1Policy is? Well, yesterday we posted an article on ISA Server Team Blog that will demystify that and much more. Check it out here: http://blogs.technet.com/isablog/archive/2008/10/29/isa-policy...
  • Blog Post: A Failed Attempt to Optimize Browsing Performance

    1. Introduction Last post I was mentioning how important it is to have a good planning phase for a technology that you are going to implement it. Planning doesn’t mean only sizing the right hardware for your needs, but also how you will configure the Server to be capable to handle the traffic that...
  • Blog Post: Identifying the Source of the Traffic

    Couple of days ago I was assisting a friend to troubleshoot the infamous 5783 that was causing the authentication prompt issue that we all know about. In this case the problem was happening throughout the night, which was even odder because during the day when the traffic was really high the issue wasn...