Question about changed special characters received in Shibboleth via IIS 7.5

[Peter Schober]

* <support.ps.ict at imtech.nl> [2013-04-23 11:51]:
> <saml:Attribute
> NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"
> Name="Achternaam"><saml:AttributeValue xsi:type="xs:string"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">Laméris</saml:AttributeValue>
> The name received by Shibboleth = Laméris. However it should be
> Laméris. So somehow along the way the special character 'é' is
> transformed into  'é'

Is the SAML assertion encrypted? If not grab it from the webbrowser
(assuming HTTP-POST binding) after the IDP issued it, e.g. using the
Mozilla Firefox "SAML Tracer" extension. Then you'll see what the IdP
sends and can compare to what your SP logs on DEBUG.
Assuming they don't match (otherwise the IdP is to blame), is there
something in the middle? A proxy? SURFfederatie/SURFcontext involved?
-peter