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<p class="MsoNormal">Thanks Brent. You make a good point, which would have been obvious to me if I had looked back at the Basic Interaction diagram on the Shibboleth
<a href="https://wiki.shibboleth.net/confluence/display/CONCEPT">home page</a><b>.<o:p></o:p></b></p>
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<p class="MsoNormal">Arthur<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">users <users-bounces@shibboleth.net> on behalf of Brent Putman <putmanb@georgetown.edu><br>
<b>Reply-To: </b>Shib Users <users@shibboleth.net><br>
<b>Date: </b>Thursday, May 20, 2021 at 4:04 PM<br>
<b>To: </b>Shib Users <users@shibboleth.net><br>
<b>Subject: </b>Re: Portable system for testing SAML 2 systems<o:p></o:p></span></p>
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<p class="MsoNormal">USE CAUTION: External Message.<o:p></o:p></p>
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Therefore, I’m looking at SAML debugging tools which I can use to isolate problems that may arise, like
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__samltest.id_&d=DwMDaQ&c=shNJtf5dKgNcPZ6Yh64b-A&r=ZCkl1RSA6OLXGMeLhWIeG8wvWwYPCSABQEpGFXsWEJg&m=OzquOH3k-k5OvUBMOIvnes7lI16wMtPnCxWcZ__HJM0&s=3Wd9eTS7zasVDPNprQHiyntipcaXiqfPPqb4OJx9m4I&e=">
SAMLTEST.ID</a>. However, I cannot use <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__samltest.id_&d=DwMDaQ&c=shNJtf5dKgNcPZ6Yh64b-A&r=ZCkl1RSA6OLXGMeLhWIeG8wvWwYPCSABQEpGFXsWEJg&m=OzquOH3k-k5OvUBMOIvnes7lI16wMtPnCxWcZ__HJM0&s=3Wd9eTS7zasVDPNprQHiyntipcaXiqfPPqb4OJx9m4I&e=">
SAMLTEST.ID</a> itself, as my site is in our Intranet, and only accessible to clients on site or connected via a VPN.<o:p></o:p></p>
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<p style="margin-left:.5in">Unless you are doing back-channel (and you almost certainly are not), the SP does not need to be reachable by the IdP directly, nor vice versa. They don't communicate directly, messages are passed front-channel via the user's browser.
As long as the user sitting at the browser can reach both, then that's fine. In other words, as long as a user sitting on your intranet or VPN can reach both your internal SP and
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__SAMLTEST.ID&d=DwQDaQ&c=shNJtf5dKgNcPZ6Yh64b-A&r=ZCkl1RSA6OLXGMeLhWIeG8wvWwYPCSABQEpGFXsWEJg&m=OzquOH3k-k5OvUBMOIvnes7lI16wMtPnCxWcZ__HJM0&s=dkxK1Q2G4rTVxMLooa8fdpONEn9_OV77Lw3Obemn69Q&e=">
SAMLTEST.ID</a> on the internet, that works. However, if your intranet or VPN restricts traffic outbound to the internet from the users' computers, then yeah, that would be a problem.<o:p></o:p></p>
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