Is mellon actually sending a logout request to Keycloak?
Do you see any error message on the keycloak server side?  We definitely support POST binding for logout. 
On 1/14/2016 8:34 AM, Michal Hajas wrote:

I'm trying to run apache + mod_auth_mellon with keycloak as indentity provider.

1. Install apache and mod_auth_mellon module
2. Generate .key, .cert, .xml files with and copy them to /mellon directory
3. Download idp_metadata.xml from keycloak/auth/realm/{REALM}/protocol/saml/descriptor and copy it to /mellon directory
4. Configure auth_mod_mellon with enclosed file auth_mellon.conf
5. Create client in keycloak from xml file generated in step 2 (There must be enabled Sign Documents, Sign Assertions signing and Force POST Binding)

Login works, when I access /auth, mellon redirect me to keycloak and after successful login it redirect me back to protected resource.

I'm not able to logout. When I access localhost/mellon/logout?ReturnTo=/, it doesn't destroy session in keycloak and in apache's error log there is:
Current identity provider does not support single logout. Destroying local session only.

Only way I was able to log out is change 

<SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="http://localhost:8080/auth/realms/mellon-test/protocol/saml"/>


<SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect" Location="http://localhost:8080/auth/realms/mellon-test/protocol/saml"/>

POST -> Redirect

in idp_metadata.xml and set "Logout Service Redirect Binding URL" to http://localhost/mellon/logout in admin console. 

Is it correct or it should work with POST binding too?

Thank you,

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Bill Burke
JBoss, a division of Red Hat