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Unable to access Sitefinity backend - HTTP error 500

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Article Number000083884
EnvironmentProduct: Sitefinity
Version: 5.x, 6.x, 7.x, 8.x, 9.x, 10.x
OS: All supported OS versions
Database: All supported Microsoft SQL Server versions
Question/Problem Description

Trying access the Sitefinity backend results in an HTTP 500 error
Navigating to /Sitefinity results in an error 500. Navigating to the full URL works:

When trying access the Sitefinity backend the site just hangs and never responds. 

Steps to Reproduce1. Host Sitefinity with http and https bindings in IIS
2. Specify a domain explicitly in Administration -> Settings -> Advanced -> System -> SiteUrlSettings
Clarifying Information
Error Message
Defect/Enhancement NumberBug 188327
Until the fix is available, use the workaround below.
1. In the web.config file find the wsFederation element and change the requireHttps property to true
2. Make sure the issuer and realm properties of the wsFederation element are set to "http://localhost". This way the correct domain is resolved dynamically:
<wsFederation passiveRedirectEnabled="true" issuer="http://localhost" realm="http://localhost" requireHttps="true" />

3. Open the ~/App_Data/Sitefinity/Configuration/SecurityConfig.config file
4. Under <securityTokenIssuers> create another entry with the same key. Change only the realm to ""
5. Under <relyingParties> create another entry with the same key and change only the realm to ""
6. Restart the application.
Last Modified Date11/2/2017 2:47 PM