Disabling IIS authentication
By default, Windows IIS directory security attempts to authenticate all requests that are made through the IIS web server. The simplest way to use IIS with FileMaker Server is to disable IIS authentication. If you disable all IIS authentication methods and use anonymous access to FMWebSite, then you don't need to add any Windows user accounts.
To disable IIS authentication:
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Open Control Panel, then choose System and Security > Administrative Tools > Internet Information Services (IIS) Manager.
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In IIS Manager, select the FMWebSite site. You may have to expand some of the nodes to see the websites.
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In the center pane, double-click Authentication.
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In the Authentication pane:
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ensure that Anonymous Authentication is enabled
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disable all other authentication methods
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