change IdP IP address and unknown artifact

[Peter Schober]

* Athanasios Douitsis <aduitsis at gmail.com> [2014-11-24 13:19]:
> Trying to change my IdP's IP address, getting errors of type:
> 
> ERROR
> [edu.internet2.middleware.shibboleth.idp.profile.saml2.ArtifactResolution:115]
> -  Unknown artifact "foo" from relying party "bar"

Are you running more than one IDP ("node") under the same name, not
sharing state?

> ERROR
> [edu.internet2.middleware.shibboleth.common.profile.ProfileRequestDispatcherServlet:88]
> - Error occurred while processing request
> java.lang.NullPointerException: null

IIRC the general statement on this list is that NPEs are (always) bugs.
Not that this alone will help you much.
-peter