Shibboleth don't get SLO request

[Andrius Kulbis]

Hello,

I have the simplesamlphp as an IDP. Then there is two servers, havind 
shibboleth SP's on them. When I try SLO from simplesaml, the server nr.1 
logout the the service correctly on the IDP and SP sides correctly 
(message in log: request for logout from (http://idp).
Server nr.2 doesnt get logout request from IDP(no message in log) and 
simplesaml says there was a problem logging out the SP. What is the 
problem?
Both servers hae identical shibboleth2.xml configuration.

Regards