First check if Dynamic compression is enabled:





Open C:\Windows\System32\inetsrv\config\administration.config with notepad and change the httpCompression tag:




For IIS 7, also change the urlCompression tag:



ISA Server

If the dynamic compression is still not working, verify there is no ISA server between the server and the client, if so follow the steps on

To check if the ISA server is the problem just open a browser on the server en connect to the localhost url, check with fiddler if the dynamic compression works.

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