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September 2005 - Posts

Thoughts on IIS Security vs Apache

I got the following interesting question about IIS security and whether it was better to "protect" IIS with an Apache server in front of it. Hmm, let's take a step back and look at what is security... Question: Hey, I really like your blog. I was wondering Read More...
Posted Friday, September 30, 2005 4:10 AM by Anonymous | 8 Comments
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HOWTO: ISAPI Filter which Logs original Client IP for Load Balanced IIS Servers

Invariably, when you run IIS servers that are load-balanced or forwarded requests behind some other network device, you will find that IIS logs the IP of the network device and not the original client that made the request. Technically, there is no standard Read More...
Posted Wednesday, September 28, 2005 6:41 AM by Anonymous | 54 Comments

HOWTO: Mass Shared Hosting on Windows with IIS6

I got this recent question concerning the "limitations of ISAPI" as it pertains to mass shared hosting on IIS6. Hmm... I had to do a double-take because I was not aware of such limitations of ISAPI - in fact, Microsoft has published a mass shared hosting Read More...
Posted Monday, September 26, 2005 11:50 PM by Anonymous | 6 Comments
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Why do I Blog?

I was sifting through my list of blog posts recently (I now have over thee dozen unpublished posts sitting around in various stages of completeness...), and I found and decided to complete this one. I actually wrote this post back on March 2, 2004 as Read More...
Posted Sunday, September 25, 2005 9:58 PM by Anonymous | 3 Comments
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HOWTO: Obtain support if DebugDiag reports ntdll.dll is responsible

Question: Hi David, Thanks for the blog / posts... I have installed the DebugDiag from MS Betas, and have heaps of reports saying... Please follow up with the vendor Microsoft Corporation for C:\WINDOWS\system32\ntdll.dll and wonder if I can shortcut Read More...
Posted Saturday, September 24, 2005 7:29 PM by Anonymous | 0 Comments
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ISAPI Extension using Managed Assemblies results in File Not Found

I recently got a question concerning ISAPI using managed assemblies. Question: Hello First of all I developed an isapi extension that was a simple one. It was working properly. I then add referneces to some managed dlls in it and copied them into windows\system32\inetsvr Read More...
Posted Saturday, September 24, 2005 5:47 PM by Anonymous | 0 Comments
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HOWTO: Diagnose one cause of 503 Service Unavailable on IIS6

I recently got this question about encountering a 503 Service Unavailable error on 64bit Windows. The author chose to uninstall .NET Framework 1.1 as the resolution, but I think there are some better alternatives... Question: I was delighted to run across Read More...
Posted Friday, September 23, 2005 11:49 PM by Anonymous | 31 Comments

HOWTO: Diagnose IIS6 failing to accept connections due to Connections_Refused

Recently, I have seen a bunch of questions asking: "IIS6 runs fine for X amount of time [where X varies from days to weeks] and then all of a sudden, it stops accepting all connections. If I restart/reboot the server, then it is fine again... until X Read More...
Posted Wednesday, September 21, 2005 11:55 PM by Anonymous | 94 Comments

Why do I lose ASP Session State on IIS6

A common, mysterious behavior encountered by ASP applications on IIS6 is the loss of session state. It seems to disappear more often and Session.Timeout seem to be ineffective. Why? Question: I have session.timout set to all day(1440 minutes). But if Read More...
Posted Monday, September 19, 2005 1:52 AM by Anonymous | 37 Comments
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HOWTO: Use IIsWebFile to Securely Run CGI in /cgi-bin from the root directory

One of the least leveraged features of IIS is the IIsWebFile, which can work absolute wonders within the proper configuration, as I will shortly show... Question: Hi I have a CGI script (in perl) in a cgi-bin directory. I want to be able to run that script Read More...
Posted Wednesday, September 14, 2005 12:30 AM by Anonymous | 8 Comments

IIS7. Why Global Managed Modules are Disallowed

Ok, I have been pretty busy the past 10 days with both work and life, and I have not had a chance to post any blog entries. While I cannot say that I am any less busy now, I definitely have a lot of catchup and posts to make... so here goes. This question Read More...
Posted Tuesday, September 13, 2005 10:31 PM by Anonymous | 15 Comments

Question about GetServerVariable QUERY_STRING

I recently got this question about the behavior of QUERY_STRING values. Unfortunately, server variable values are more a matter of art than science, as I will shortly describe... Question: Hi David, I am having an interesting problem. I have written an Read More...
Posted Monday, September 12, 2005 11:09 PM by Anonymous | 4 Comments
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HOWTO: Provision ASP.Net AppDomains and IIS6 Application Pools

This is a frequent source of confusion - how ASP.Net and IIS does application isolation. The key point to remember is that IIS runs native code and thus relies on NT user identity (and thus NT process) for isolation, while ASP.Net runs managed code with Read More...
Posted Thursday, September 01, 2005 11:55 PM by Anonymous | 15 Comments
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Can ISAPI Filter remove entries from the IIS log file?

I recently got this question about how to not log certain requests to the IIS log file. Question: As a hosting provider on several high traffic IIS6 based sites, we see TONS of disk space chewed up by the log entries that reflect our remote monitoring Read More...
Posted Thursday, September 01, 2005 8:00 AM by Anonymous | 4 Comments
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