我可能遇到过Java最奇怪的问题之一。我尝试启动一些应用程序，例如Wrapper（即I2P路由器），并得到以下信息：
-路由器日志的一部分
03.12.12 21:07:31 ERROR [JobQueue 1/1] p.router.transport.UPnPManager: UPnP start failed - port conflict?
03.12.12 21:07:31 CRIT [JobQueue 1/1] ter.transport.ntcp.EventPumper: Error opening the NTCP selector
java.io.IOException: Unable to establish loopback connection
Caused by: java.net.SocketException: Permission denied: listen
包装日志的一部分
2012/12/02 14:28:29 | Unable to bind routerconsole to 127.0.0.1 port 7657: java.net.SocketException: Permission denied: listen failed
2012/12/02 14:28:29 | You may ignore this warning if the console is still available at http://localhost:7657
2012/12/02 14:28:30 | WARNING: Error starting SelectChannelConnector@::1:7657: java.io.IOException: Unable to …