There is an issue where SC is showing you following message and clicking OK closes the SC.
Affected versions are at least SAP Contact Center SP6 & SP6P1 & SP7.
Add your SC URL to Java Exception Site List
JAVA 7 & 8:
No idea how to do it... If somebody knows please share it with us.
UPDATE: Alex told me that in Jave 6 you can skip the warning and continue using SC.
SAP Contact Center team
Error message for search engines:
Your security settings have blocked an application signed with an expired or not-yet-valid certificate running