Hi all,

I have successfully config to delegate the authentication process to DUO 
SSO using SAML. 

However, when I try to SLO, the logout request was stop at the CAS server 
and do not redirect to DUO SSO to perform Duo session logout. The browser 
just only showing the blank page on CAS server URL and didn't redirect back 
to the application's logout page at the end.

When I checked the access log in the CAS server, I can see the incoming 
request as below:
"GET /cas/idp/profile/SAML2/Redirect/SLO?SigAlg=XXXXX HTTP/1.1" 200 0 
"http://XXX.XXX.XXX.XXX/"; "Mozilla/5.0 (Windows NT 10.0; Win64; x64; 
rv:108.0) Gecko/20100101 Firefox/108.0"

But it is strange that the http response status was 200 instead of 302 
which I expect the request to be redirected back to the application server.

Furthermore, if I manually refresh the same CAS URL which stopped at the 
browser, the CAS server can response 302 and then redirect the request to 
the application server.

I have checked the cas server log and can only find the following warning,
| 2023-01-17 08:06:17,315 WARN 
[org.pac4j.saml.logout.SAML2LogoutActionBuilder] - <Identity provider has 
no single logout service available for the selected profile 
urn:oasis:names:tc:SAML
:2.0:bindings:HTTP-Redirect>

On the other hand, the Duo SSO SAML metadata file didn't have the 
[SingleLogoutService ] attribute.

I wonder if it is the cause of my issue. Anyone has the same experience 
could give some advices to me?

Thank you very much.
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