How to use the IIS Diagnostics Toolkit's WFetch 1.4 utility

Learn how to use the IIS Diagnostics Toolkit's WFetch 1.4 utility to troubleshoot connectivity issues between IIS and Web clients.

When you are troubleshooting connectivity issues between Internet Information Services (IIS) and Web clients, you...

may want to view data that is not displayed in the Web browser. WFetch is a GUI designed to help administrators resolve problems related to browser interaction with a Microsoft IIS Web server. WFetch allows a client to reproduce a problem with a lightweight, HTTP-friendly test environment.

Note: WFetch does not log the TCP handshake data used to establish and close TCP sessions.

Key features


  • Configurable host name

  • Configurable TCP port

  • HTTP 1.0 and HTTP 1.1 support

  • Multiple authentication types (Anonymous, Basic, NTLM, Kerberos, Digest, Negotiate)

  • Client-certificate support

  • Multiple connection types (HTTP, HTTPS, PCT 1.0, SSL 2.0, SSL 3.0, TLS 3.1)

  • Proxy support

  • Advanced requests that are entered manually or read from a file

  • On-screen and file-based logging

To use the WFetch utility:

  1. Select the VERB you wish to use.

  2. In the Host box, type the name of a Web site (for example,

  3. In the Path box, select the path of the file, folder, or application on the Web site that you used in step 1 (for example, /default.asp).

  4. Add any additional options based on the test that is being performed

  5. Click Go.

For additional instructions, see Microsoft Knowledge Base article 284285, "How to: Use WFetch.exe to troubleshoot HTTP connections.

Inside the IIS Diagnostics Toolkit

 How to install the Microsoft IIS Diagnostics Toolkit
 How to use SSL Diagnostics 1.0
 How to use Authentication and Access Control Diagnostics (AuthDiag) 1.0
 How to use Exchange Server SMTP Diagnostics 1.0
 How to use Log Parser 2.2
 How to use WFetch 1.4
 How to use Trace Diagnostics
 How to use Debug Diagnostics 1.0

About the author: Tim Fenner (MCSE, MCSA: Messaging, Network+ and A+) is a senior systems administrator who oversees a Microsoft Windows, Exchange and Office environment. He is also an independent consultant who specializes in the design, implementation and management of Windows networks.

This was first published in October 2007

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