** SPAM scored: Med **Re: our SP seems to connect using the wrong IP address

Maassen, Helma Helma.Maassen at atos.net
Thu Nov 29 12:08:01 EST 2012

Thanx for your swift reply.
I need to think this over (again) :-)
Your comments are good input to look at it from a different perspective.
I will let you know when I've succeeded!

Helma Maassen
Atos Nederland B.V.
Technology Services Zuid
High Tech Campus 52
5656 AG Eindhoven
On 11/29/2012 05:32 PM, Cantor, Scott wrote:

On 11/29/12 11:28 AM, "Maassen, Helma" <Helma.Maassen at atos.net><mailto:Helma.Maassen at atos.net> wrote:

We're hosting an SP on a multiinterfaced linux machine;
url                IP                 certificate        interface
dloket.xxxxx.nl    xxx.xxx.xxx.208    dloket.xxxxx.nl    eth0
dmid.xxxxx.nl      xxx.xxx.xxx.209    dmid.xxxxx.nl      eth0:0


It seems that the SOAP connection between our SP and (not our) IdP for
resolving the artifact, is set up by our SP, but using the dmid.xxxxx.nl
address/interface. That what is reported by the people from the IdP.

Ok. So that has nothing to do with Apache of any stripe, obviously.

The public certificate that we shared with the IdP is for
dloket.xxxxx.nl, and not dmid.xxxxx.nl, so when they "check the
certificate", the CN does not match the url.

If it's a Shibboleth IdP, what matters is that the public key you gave
them matches. The content of the certificate is totally irrelevant, nor
should you be using a TLS server cert from your web server in any SAML
communication to an IdP. That should be a separate credential.

If it's not a Shibboleth IdP, then all bets are off, but this has nothing
to do with URLs. Your client cert has nothing to do with your web server's

Thanks to your earlier tip on that CURLOPT_INTERFACE, we now can make a
connection using the dloket.xxxxx.nl address, but is that the only way to
convince Shibboleth to use that interface to setup the connection?

Yes, but that isn't your issue. The interface it's using has *nothing* to
do with the certificate it's using. The SP decides that, not your web

We need to configure a server park of about 90 servers (with diff.
interfaces), so I would like to make sure before I have to configure them
all over again.

Don't. It's not the issue.

-- Scott

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