Type Exception Report
Message Connection to http://ir.ncnu.edu.tw refused
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.http.conn.HttpHostConnectException: Connection to http://ir.ncnu.edu.tw refused org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:127) org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:147) org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:101) org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:381) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554) org.apache.portals.applications.webcontent.proxy.impl.RewritableHttpReverseProxyServiceImpl.invoke(RewritableHttpReverseProxyServiceImpl.java:445) org.apache.portals.applications.webcontent.proxy.impl.DefaultHttpReverseProxyServlet.service(DefaultHttpReverseProxyServlet.java:463) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.net.ConnectException: Connection refused (Connection refused) java.net.PlainSocketImpl.socketConnect(Native Method) java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) java.net.Socket.connect(Socket.java:607) org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:123) org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:123) org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:147) org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:101) org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:381) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576) org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554) org.apache.portals.applications.webcontent.proxy.impl.RewritableHttpReverseProxyServiceImpl.invoke(RewritableHttpReverseProxyServiceImpl.java:445) org.apache.portals.applications.webcontent.proxy.impl.DefaultHttpReverseProxyServlet.service(DefaultHttpReverseProxyServlet.java:463) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.