[2013-09-10 15:43:27,535 pool-17-thread-1 INFO com.vmware.vim.dataservices.federation.FederationReconfigurator] Error connecting to peer:https://xxxxxxxxxx:10443 reason: org.apache.http.conn.HttpHostConnectException: Connection to https://xxxxxxxxxxx:10443 refused
I guess that is the time stamp when you tried to open the page and not the installation time stamp?
From my point of view the connection to your inventory service is looking fine, the issue should be the interaction between vCenter, Inventory Service and SSO.
Could you have a look in the SSOAdminServer.log for any kind of backtraces around the installation time stamp?