> Does Shibboleth IdP 3 support unsolicited sso I cannot find the reference right now, but the answer is yes. IdPV3 supported the same end points as V2 and this includes the IdP-Initiated point (supported out of the box) https://wiki.shibboleth.net/confluence/display/SHIB2/IdPUnsolicitedSSO tells you how to set up the link.