David Wang

David Wang on IIS, ISAPI, Exchange, Virtual Server, and whatever else I fancy...

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  • Blog Post: HOWTO: Maximize the Number of Concurrent Connections to IIS6

    Question: I'm considering building a realtime ASP.NET application on IIS6, that'll need to support about 3,000 simultaneous users on a server, each with a keep-alive HTTP connection for "server push." The HTTP connection will need to stay open for the duration of the user's session, to allow updates...
  • Blog Post: IIS6 and HTTP Server API, Part 1

    Question: Hi, I've found these articles: http://support.microsoft.com/default.aspx?scid=kb;en-us;q311852 http://support.microsoft.com/default.aspx?scid=kb;en-us;q327611 First of all I've got a question. READ_RAW_DATA can be used to modify the request body not only the headers. Why is it gone...
  • Blog Post: HTTP.SYS, IIS, and the 100 continue

    Question: Hi David, "My Company" is a leading middleware provider for mobile multiplayer games. Cutsomer like Disney, THQ etc. The backend is built on .NET. We went live in the US with W2K3/IIS6 which is great. But we have a major IIS6 issue. The handsets connect through HTTP/POST and sometimes...
  • Blog Post: Does IIS6 truncate HTTP headers at a hard-coded limit?

    Question: Using IIS the HTTP_ACCEPT header server variable received from the client appears to have a hard coded limit of 259 characters. This is causing problems when using a Windows Mobile 5 Smartphone which has a longer string than 259 characters which is getting truncated. The phone then receives...
  • Blog Post: HOWTO: Measure Effectiveness of the HTTP.SYS Kernel Mode Response Cache with IIS 6

    Hmm... ever since I wrote the referenced blog entry about HTTP.SYS Kernel Response cache and IIS 6.0, I have gotten questions about one thing that I forgot to mention - how to determine the effectiveness of the Kernel Response Cache. Here goes... Question: David, To begin, I happened to come...
  • Blog Post: HTTP.SYS rejection of request lines not terminated by CRLF (Redux)

    Ok... this is the second day in a row now where I am answering a blog comment where I think the answer already exists in one or more of my blog entries. I am now wondering how to avoid having to make redux posts because I am sure there will be a third, a fourth, etc... hey, I have no problems making...
  • Blog Post: Kernel Caching in IIS 6 (Redux)

    Hmm, I got the following question today, and since I had a blog entry that exactly answered the question already, it made me wonder about the visibility of my blog entries to searching... Question: Hi David, I am sure you have a ton of requests for content on your blog but you never seem to...
  • Blog Post: 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 amount of time later, when I have to repeat the same...
  • Blog Post: Controlling network packet size from IIS/ASP.Net?

    I got this question about response packet size control... Question: Running a web app - native .NET. 2003 for server. Reports come out as garhugic (66K) packets in testing. Is there a way to control max packet size from within .NET at the program level or within the IIS settings? Answer: ...
  • Blog Post: HOWTO: Use the HTTP.SYS Kernel Mode Response Cache with IIS 6

    Motivation One of the bigger buzz-word features of IIS 6.0 on Windows Server 2003 is the "HTTP.SYS Kernel Mode Response Cache". When you do a search against "HTTP.SYS Kernel Response Cache IIS 6", you will inevitably find a large body of literature repeatedly talking about how the kernel mode response...
  • Blog Post: HTTP.SYS rejection of request lines not terminated by CRLF

    I recently got the following question about an HTTP.SYS behavior in Windows Server 2003. Question: Hi David, I have a major problem switching to W2K3 and IIS6 currently. Major handsets in the market (e.g. Nokia) send WRONG HTTP requests - nothing to do against it! Wrong means not seperated...
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