Error Message: No peer endpoint available to which to send SAML response

[Peter Schober]

* palak <pallavigupta_1 at hotmail.com> [2013-09-30 06:29]:
> 00:10:46.460 - ERROR
> [edu.internet2.middleware.shibboleth.idp.profile.AbstractSAMLProfileHandler:447]
> - No return endpoint available for relying party
> https://localhost/shibboleth

Are there other WARN or ERROR messages in the log before that?
Check the IdP logs for indicators that testshib actually loaded your
SP's metadata.

Here's the list of reasons this can happen (look for your error message):
https://wiki.shibboleth.net/confluence/display/SHIB2/IdPTroubleshootingCommonErrors
None of which are likely if testshib indeed has loaded your metadata,
so I would suspect a problem caused by previous registrations using
the name "localhost".
So I would start by removing everything from testshib, changing your
SP's entityID in shibboleth2.xml (it can be any URI) to make it (more)
unique and re-add updated metadata for your SP to testshib.
-peter