Both smps.log and smtracedefault.log show repeated messages similar to these:
What is the cause of these messages
Release : 14.3
Component : IDENTITY SUITE (VIRTUAL APPLIANCE)
This behavior can occur when integrated products perform periodic health checks or when a load balancer closes connections due to session timeout settings. Load balancers commonly initiate health checks that do not complete a full handshake, which can result in these messages.
If the SSO is working as expected, this message can be ignored.