The CAS server returned no response

单点登录(CAS)登录成功之后，报错严重: java.io.IOException: Server returned HTTP response code: 500 for URL: http://192.168.1.109:3389/server/serviceValidate?service=http%3A%2F%2Fhtml%3A8080%2Fblog%2Fquery%2Fzhkh.do&ticket=ST-1-umPpF3DQYHPgVhrtRZVh-server&
java.io.IOException: Server returned HTTP response code: 500 for URL: http://192.168.1.109:3389/server/serviceValidate?service=http%3A%2F%2Fhtml%3A8080%2Fblog%2Fquery%2Fzhkh.do&ticket=ST-1-umPpF3DQYHPgVhrtRZVh-server&
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1196)
警告: org.jasig.cas.client.validation.TicketValidationException: The CAS server returned no response.
org.jasig.cas.client.validation.TicketValidationException: The CAS server returned no response.具体配置如下：
服务端：
IP：192.168.1.109端口：3389
应用名称为server(部署项目名)
cas.propertiescas.securityContext.serviceProperties.service=http://192.168.1.109:3389/server/services/j_acegi_cas_security_check
cas.securityContext.casProcessingFilterEntryPoint.loginUrl=http://192.168.1.109:3389/server/login
cas.securityContext.ticketValidator.casServerUrlPrefix=http://192.168.1.109:3389/servercas.themeResolver.defaultThemeName=default
cas.viewResolver.basename=default_viewshost.name=server#database.hibernate.dialect=org.hibernate.dialect.OracleDialect
#database.hibernate.dialect=org.hibernate.dialect.MySQLDialect
database.hibernate.dialect=org.hibernate.dialect.HSQLDialect客户端：
IP：192.168.1.101
web.xml<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
<param-name>serverName</param-name>
<param-value>192.168.1.101:8080</param-value>
</context-param>

<!--  -->
<listener>
<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>

<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<url-pattern>/login/logout.do</url-pattern>
</filter-mapping>

<filter>
<filter-name>CASFilter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<param-value>http://192.168.1.109:3389/server/login</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>CASFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
 
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>
org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>
<init-param>
<param-name>casServerUrlPrefix</param-name>
<param-value>http://192.168.1.109:3389/server</param-value>
</init-param>
<init-param>
        <param-name>redirectAfterValidation</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping> <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>
</web-app>
网上说是因为不能连接外网，但是我能连外网。请问，如何解决