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SAML authentication fails if it has hundreds of attributes with the following errors:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
<BODY><h2>Bad Request - Request Too Long</h2>
<hr><p>HTTP Error 400. The size of the request headers is too long.</p>
There is a limitation on HTTP Header size in Windows and Qlik Sense follows it.
The maximum header length is 16 KB.
When doing this the HTTP header length can be up to 64kb. There is a risk with doing this since it effects all other programs on the machine using the built in HTTP stack. The user can do it but on their own risk.
More information: https://support.microsoft.com/kb/820129
FYI: There is a known bug in Windows2012 and Windows7 that the registry key change doesn't work.
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