"Value cannot be null" Error on Sitefinity Backend

Posted by Community Admin on 04-Aug-2018 00:55

"Value cannot be null" Error on Sitefinity Backend Log-in Page

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Posted by Community Admin on 13-Sep-2012 00:00

I randomly started receiving a "Value cannot be null exception" when trying to access the Sitefinity backend log-in screen (see attached screenshot).    I receive this error for both of the following cases: 
http://localhost:37499/site/Sitefinity/   (direct)
http://localhost:37499/site/Sitefinity/Authenticate/SWT?realm=...  (redirected from other page)

I can't pinpoint exactly when it started happening, but it was soon after I changed the permissions of a page to Authenticated users.  I have since reverted this change but am still experiencing the issue.  I now have to use the log-in page I created within my web site and log-in as an Administrator in order to do any backend administration.

My site is running on Sitefinity 5.1.3210.0 with IIS 7 (via Sitefinity Project Manager) and using Claims Authentication.

I have searched the forums and found the following thread which seems like the same issue I am experiencing. However, none of the suggested solutions seem relevant in my case.

This thread is closed