AsiaTech: Microsoft APGC Internet Developer Support Team

We focus on various troubleshooting plan and solution on IIS web platform and distributed applications

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  • Blog Post: 400 bad request when POSTing WebService or WCF request from IE

    Symptom Let’s suppose such a scenario: Ø You have a website which enables NTLM authentication. Ø There’s a virtual directory under this website, which enables Anonymous authentication. Ø There’s a Web Service or WCF Service in this virtual directory...
  • Blog Post: How to write chunked transfer encoding web response

    Recently I worked on a performance issue caused by IIS re-authenticate for every request. From network monitor log, it was due to poor designed of chunked encoding of a CGI and then IIS close HTTP Connection according HTTP 1.1 protocol, details below. This issue was resolved after we fixed customer’s...
  • Blog Post: How to configure "RPC over HTTP" for DCOM communication in Windows 2003

    Background RPC-over-HTTP enables client programs to use the Internet to execute procedures provided by server programs on distant networks. RPC over HTTP tunnels its calls through an established HTTP port. Thus, its calls can cross network firewalls on both the client and server networks. RPC over...
  • Blog Post: Troubleshooting IIS: HTTP/FTP

    1. Why private IP address is still revealed on IIS server even after applying fix 834141 2. IIS FTP Service Hang Due to Ports Contention in Passive-Mode 3. FTP client application encounters slow file download performance issue 4. Fail to send PORT command in FTP with...
  • Blog Post: Why My HTTP Service Cannot Be Stopped.

    Symptom: In order to stop listening port 80 of IIS on windows server 2008 on which SQL Server 2008 is installed, we change the port of IIS website to non-80. Unfortunately, we find that the port 80 is still listening by PID 4. When we try to stop HTTP service using command: net stop http , we receive...
  • Blog Post: HTTP HEAD Requests get 405 HTTP error when access SOAP Web Services

    Most people are familiar with HTTP GET and POST requests. But actually HEAD is another useful verb. HEAD Request and 405 Problem Below is the response from an IIS 6 server using WFetch . Note that the response only contains header information, so it is really a neat way to check site availability...
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