Unable to establish security of incoming assertion

[Peter Schober]

Please provide a proper subject in emails to this list.

* Yasser Afifi <yasser at 3dissue.com> [2016-01-20 17:47]:
> Unable to establish security of incoming assertion.

Documentation home for the Shibboleth SP:
https://wiki.shibboleth.net/confluence/display/SHIB2/

follow the link "Troubleshoot":
https://wiki.shibboleth.net/confluence/display/SHIB2/Troubleshooting

"Native Service Provider (SP)" -> "Common errors":
https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPTroubleshootingCommonErrors

It's the third from the top there:
https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPTroubleshootingCommonErrors#NativeSPTroubleshootingCommonErrors-Unabletoestablishsecurityofincomingassertion
-peter