Hi IIS experts, I am pretty new to the IIS . we are using IIS 8.5 and the box is windows server 2012. we started integrating the IIS with our caching and loadbalancing toll called dispatcher (https://docs.adobe.com/docs/en/dispatcher.html). The integration has an dll and according to the documentation (https://docs.adobe.com/docs/en/dispatcher/disp-install.html#Configuring%20Microsoft%20IIS) we are able to successfully integrate the same and request from IIS is reaching dispatcher. we have enabled windows authentication with IIS to authenticate the USER using kerberos token which is also working fine. The current issue i am facing is when we are trying to access site in IE there are lots of 401 errors (challenged by IIS) getting logged and count is huge in numbers. By googling we enabled AuthPersistNonNTLMproperty to true and saw the 401 errors are reduced but not completely. we see 401 issue for the requests which has content type as "text/html" and other request are 200. for couple of requests eventhough the extension is an image (like .jpg,.png etc) the content-type is "text/html" and 401 error is coming up. this i have seen using fiddler and request logs of IIS. can you please let me know workaround to resolve the issue.
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