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[guysoft <guysoft@xxxxxxxxxx>]

Hello there,
Debian here, had the same problem in a file /etc/sysctl.d/bindv6only.conf
The above fixed it

-- 
Network unreachable in java only
https://bugs.launchpad.net/bugs/486215
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Status in “openjdk-6” package in Ubuntu: New
Status in “sun-java6” package in Ubuntu: New
Status in “openjdk-6” package in Debian: Confirmed

Bug description:
After the last apt-get update/dist-upgrade, my java applications have stopped working. I can browse, play online games, chat and whatever else applications run fine, but my java applications all error out like this:

Error while sending packet to 70.83.141.197:38954: java.io.IOException: Network is unreachable

I have not changed any settings, firewalls or anything else related to the network in this timeperiod. Everything looks normal to me, I can for example without problems complete a traceroute:

kjellrs@arrakis:~$ sudo tracert 70.83.141.197
[sudo] password for kjellrs:
traceroute to 70.83.141.197 (70.83.141.197), 30 hops max, 60 byte packets
 1  192.168.0.1 (192.168.0.1)  0.130 ms  0.131 ms *
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * ti3003c310-ae6-0.ti.telenor.net (146.172.100.37)  14.940 ms  14.950 ms
 7  ti3004b300-ae1-0.ti.telenor.net (146.172.105.34)  14.965 ms  15.007 ms  14.973 ms
 8  212.73.252.1 (212.73.252.1)  19.675 ms *  20.050 ms
 9  * * *
10  * * *
11  * * *
12  * * *
13  * ae-1-51.edge4.Amsterdam1.Level3.net (4.69.139.138)  37.923 ms  37.764 ms
14  acr1-so-3-0-0.Amsterdamamx.savvis.net (208.174.49.1)  38.719 ms  38.741 ms  38.763 ms
15  dcr1-so-1-0-0.amsterdamamx.savvis.net (204.70.193.146)  38.619 ms  41.915 ms  41.998 ms
16  cr2-pos-0-15-3-0.Washington.savvis.net (204.70.192.125)  135.875 ms  135.896 ms  135.775 ms
17  cpr2-ge-5-0.virginiaequinix.savvis.net (204.70.193.101)  130.292 ms  130.367 ms  130.390 ms
18  216.113.122.85 (216.113.122.85)  159.882 ms  159.961 ms *
19  * * *
20  * * *
21  * * *
22  * * *
23  * modemcable197.141-83-70.mc.videotron.ca (70.83.141.197)  166.913 ms  171.963 ms

Is there possibly some sort of policy that could be blocking java? I have made absolutely no such policy configuration, but this is an upgrade from jaunty to karmic...

ProblemType: Bug
Architecture: i386
Date: Sat Nov 21 10:46:20 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: sun-java6-bin 6-15-1
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: sun-java6
Uname: Linux 2.6.31-14-generic i686
XsessionErrors: (polkit-gnome-authentication-agent-1:2532): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed