CAS SERVER 需要连外网吗？急。。。

Question

各位大侠，小弟有个问题。就是cas 单点登录正常
单点登出的时候 。报错。。java.net.UnknownHostException:  www.xx.com at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at sun.net.NetworkClient.doConnect(NetworkClient.java:158)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:860)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:801)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:904)
at org.jasig.cas.util.HttpClient.sendMessageToEndPoint(HttpClient.java:68)
at org.jasig.cas.authentication.principal.AbstractWebApplicationService.logOutOfService(AbstractWebApplicationService.java:147)
at org.jasig.cas.ticket.TicketGrantingTicketImpl.logOutOfServices(TicketGrantingTicketImpl.java:119)
at org.jasig.cas.ticket.TicketGrantingTicketImpl.expire(TicketGrantingTicketImpl.java:131)
at org.jasig.cas.CentralAuthenticationServiceImpl.destroyTicketGrantingTicket(CentralAuthenticationServiceImpl.java:153)
at org.jasig.cas.web.flow.SendTicketGrantingTicketAction.doExecute(SendTicketGrantingTicketAction.java:47)
at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:192)
at org.springframework.webflow.engine.AnnotatedAction.execute(AnnotatedAction.java:146)
at org.springframework.webflow.engine.ActionExecutor.execute(ActionExecutor.java:59)
at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:156)
at org.springframework.webflow.engine.State.enter(State.java:191)是不是因为 服务器不能上网的原因还是什么原因/??? 急。。谢谢

Answer 1

struts-config.xml中的dtd网址 需要联网的时候才可以 

Answer 2

dtd 文件 ，如果本地能找到合适版本的dtd 是不需要上网的。。这个cas server 不知道要不要联网。。我单点退出的时候。报 这个错误。。找不到原因。。服务器不能联网

Answer 3

估计不大可能。因为直接请求，http://logout.xxx.com/cas_server/logout?followServiceRedirects=true&service=http://www.xx.com然后cas server报错。java.net.UnknownHostException:
但是跳转到 http://www.xx.com 正常