IIS8 403.501 Errors
3 years ago
Originally Published: 2015-10-23
Article Number
000042701
Issue
Individual iViews, regardless of type, intermittently fail to load, reporting “403: access forbidden” errors. These errors occur even when anonymous access is turned on.
Whole website fails to load completely, giving no error to the user and any links contained in the site that did load do not work.
 
Cause
IIS 8 has a new Action menu item in its  [IP Address and Domain Restrictions] setting, “Edit Dynamic Restrictions”. If enabled this will cause the web server to stop responding to the client computer.
Resolution
The solution is to turn off Dynamic Restrictions:
1. In IIS 8, open [IP Address and Domain Restrictions]
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2. In the right panel, select “Edit Dynamic Restriction Settings…”
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3. Uncheck the top two checkboxes, “Deny IP Address based on the number of concurrent requests” and “Deny IP Address based on the number of requests over a period of time” and press [OK]
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Notes
The administrator of the web server may require this setting to be turned on. It is possible that having the restriction values set high enough would most likely stop the issue. That value is not known at this time, trial and error testing at time of troubleshooting with increasing values will be necessary.

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