Single Log Out with multiple domains

[Peter Schober]

* Oleg Kostenko <oleg.kostenko at actimind.com> [2016-12-02 09:41]:
> I have a web application which is spread across two different domain names,
> let's say domain1.com and domain2.com.
> 
> I successfully implemented SSO in this application with Shibboleth, however
> I'm not sure how to properly implement SLO.

Domains (shared or not) do not factor into SAML, at all.
So whatever you think is the reason for your SLO failing has nothing
to do with the fact that two (or 42) SPs share a common DNS domain or
not.
-peter