CVS做的sso单点登录（集成普元BPS）报这个错误，希望牛人们给点意思
java.lang.RuntimeException: java.net.ConnectException: Connection refused: connect
org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:341)
org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:305)
org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:50)
org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:207)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:169)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:116)
org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:76)
