In Some cases when we click on the ISAPI filter in the IIS we get the following error,
"Cannot add duplicate collection entry of type 'filter' with unique key attribute 'name' set to 'urlprotect' "In such cases we can easily solve this error by make changes in the ApplicationHost.config file of the server. Please follow the steps below,
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1) Access the server and locate the "applicationHost.config" file. It's Location will be " C:\Windows\System32\inetsrv\config\applicaiponHost.config"
2) When you click on the ISAPI filter in IIS it will show the error with a line number, locate that one in applicaitonHost file and find the duplicate entry for that file,
For Example: Suppose , if below line is specified in the error,
<add users="*" path="*" access="Read" /> -----------> Line 965
Then search for the duplicate of this entry,
3) Add " <clear /> " above the duplicate entry . This will fix the issue with the ISAPI filter error===============
Hope this helps
Sumesh
