Loopback connection fail

java exception connection wrapper loopback
user1874894 picture user1874894 · Dec 4, 2012 · Viewed 16k times · Source

I have probably one of the weirdest problems with Java ever. I tried to start some application say Wrapper (i.e. I2P router) and got the following:

-piece of the router log-

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

-piece of the wrapper log-

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 establish loopback connection
2012/12/02 14:28:30 | java.io.IOException: Unable to establish loopback connection
2012/12/02 14:28:30 | WARNING: Error starting one or more listeners of the Router Console server.
2012/12/02 14:36:41 | CRIT  [istener:7654] er.client.ClientListenerRunner: I2CP error listening to port 7654 - is another I2P instance running? Resolve conflicts and restart

On the developers forum I was told that it could be possibbly that I hadnt a loopback address at all. Which is unlikely to be. I have other application which work with the loopback address, also I switched off the IPv6, put all the neccessary options to ignore IPv6 in wrapper. Next I tried to start wrapper under the admin aacount, tried to install all the stuff including Java under the admin account - completelly useless.

I didnt find any reasonable answer on any foruma. Always it was about the firewall. But I turned it off, I deinstalled it, switched Windows firewall off under the admin account.

And also I opened all the necessary ports on my wi-fi router. Other programs like Privoxy work well with loopback connection and ports, but if I check online ofcourse I get a message that all my ports blocked, which I consider as to be wrong.

My operating system is Windows 7 64bit, my wi-fi router is Speedport 723v.

I thank everybody in advance for answers.

Answer

Evgenij Pashkin picture Evgenij Pashkin · Jul 21, 2013

It was the same problem with I2P and jre7u25

Fixed editing wrapper.config by adding -Djava.net.preferIPv4Stack=true to jawa paramenters:

wrapper.java.additional.5=-Di2p.dir.config="C:\ProgramData\Application Data\i2p" -Djava.net.preferIPv4Stack=true

Related questions

java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)

The following code: Class.forName("com.mysql.jdbc.Driver"); Connection m_connection = DriverManager.getConnection("jdbc:mysql://localhost","root","root"); Throws this exception on getConnection(): java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES) at com.mysql.jdbc.…

Read More
java.rmi.ConnectException: Connection refused to host: 127.0.1.1;

java.rmi.ConnectException: Connection refused to host: 127.0.1.1; nested exception is: java.net.ConnectException: Connection refused at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619) at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) at sun.rmi.transport.tcp.TCPChannel.newConnection(…

Read More
In Java when does a URL connection close?

When does java let go of a connections to a URL? I don't see a close() method on either URL or URLConnection so does it free up the connection as soon as the request finishes? I'm mainly asking to see …

Read More