"Permission denied" using socket with IPv6

[Michael McMahon]

Sounds like a native configuration issue all right. The native
connect appears to be getting an EPERM which according to Linux manpage
could be caused b a local firewall rule

Michael

On 01/06/15 21:14, Bobby Bissett wrote:
> Hi all,
>
> Can someone tell me how to diagnose this issue? I can't create a 
> connection to another node using IPv6 because of the error below -- a 
> short app demonstrates the problem. Everything I've found online so 
> far is aimed at using IPv4 instead, but that's not my goal. This is on 
> a Centos 6.6 virtual machine.
>
> --- begin ---
> [root at TWO test]}> java -version
> java version "1.7.0_79"
> OpenJDK Runtime Environment (rhel-2.5.5.3.el6_6-x86_64 u79-b14)
> OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
> [root at TWO test]}>
> [root at TWO test]}>
> [root at TWO test]}> cat IPv6Test.java
> import java.net.InetAddress;
> import java.net.Socket;
>
> public class IPv6Test {
>
>     public static void main(String[] args) {
>         try {
>             InetAddress ia = 
> InetAddress.getByName("fe80::20c:29ff:fe98:9210");
>             System.err.println("Opening socket for: " + ia);
>             Socket socket = new Socket(ia, 7800);
>             System.err.println("We have: " + socket);
>         } catch (Exception e) {
>             e.printStackTrace();
>         }
>     }
> }
> [root at TWO test]}>
> [root at TWO test]}> javac IPv6Test.java && java IPv6Test
> Opening socket for: /fe80:0:0:0:20c:29ff:fe98:9210
> java.net.SocketException: Permission denied
> at java.net.PlainSocketImpl.socketConnect(Native Method)
> at 
> java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
> at 
> java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
> at 
> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
> at java.net.Socket.connect(Socket.java:579)
> at java.net.Socket.connect(Socket.java:528)
> at java.net.Socket.<init>(Socket.java:425)
> at java.net.Socket.<init>(Socket.java:241)
> at IPv6Test.main(IPv6Test.java:10)
> [root at TWO test]}>
> [root at TWO test]}> java -version
> java version "1.7.0_79"
> OpenJDK Runtime Environment (rhel-2.5.5.3.el6_6-x86_64 u79-b14)
> OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
> --- end ---
>
> From this node, am able to ping6 the address fine:
>
> [root at TWO test]}> ping6 -I eth3 fe80::20c:29ff:fe98:9210
> PING fe80::20c:29ff:fe98:9210(fe80::20c:29ff:fe98:9210) from 
> fe80::20c:29ff:fec6:91a eth3: 56 data bytes
> [...]
> 2 packets transmitted, 2 received, 0% packet loss, time 1023ms
>
> I don't have selinux or a firewall running, not that I think that 
> would matter since Java can't start to connect anyway from the message 
> above.
>
> Thanks,
> Bobby
>

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