IIS ignores shibd

[Jukka Hakosalo]

I use IIS7 for the first time. I have problems with Shibboleth SP 2.4.
In server there is a site 'site1.city.fi'.
Under that site there is a folder 'testfolder'. In the folder there is
'testpage.html'.

Shibd starts ok and 'shibd -check' says:
'ovarall configuration is loadable, check console for non-fatal problems'

Browser let's me go directly to
'https://site1.city.fi/testfolder/testpage.html' without asking
anything.
'https://site1.city.fi/tesfolder' is the path i try to shibbolize.

Our idp is working well with many other SPs. Metadatas should be ok.

Nothing comes to shib.log. Here are some parts from shibboleth2.xml:

<ISAPI normalizeRequest="true" safeHeaderNames="true">
  <Site id="1" name="site1.city.fi"/>
</ISAPI>
.
.
<TCPListener address="127.0.0.1" port="1600" acl="127.0.0.1"/>
.
.
<RequestMapper type="Native">
   <RequestMap>
     <Host name="site1.city.fi" redirectToSSL="443">
        <Path name="testfolder" authType="shibboleth" requireSession="true"/>
     </Host>
   </RequestMap>
</RequestMapper>
.
.
<ApplicationDefaults entityID="https://site1.city.fi/shibboleth-sp"
                     homeURL="https://site1.city.fi"
                     REMOTE_USER="eppn">

.
.
<SSO entityID="https://idp.city.fi/idp/shibboleth">
     SAML2 SAML1
</SSO>
.
.
Shibd finds certificates, metadata, attribute-map and other files.

IIS totally ignores shibboleth. ISAPI Filter seems to be ok.
I think that the problem is in IIS. With Apache i've never had these
kind of difficulties.
Can someone help?