openjdk takes long time to download an JavaWS application

[Arie Skliarouk]

I am trying to open an JavaWS application, the jar download window appears (see attached) but it takes long time (several minutes) to download the jar file.

Could be the problem is related that openjdk initially opens the connection over tcp6 and then falls back to tcp4?

I have no tcp6 in the network, no idea why it thinks I have it.

Configuration: ubuntu 11.10 (oneiric), openjdk-6-jre 6b23~pre11-0ubuntu1.11.10, icedtea-netx 1.1.3-1ubuntu1.1.

# netstat -anp | grep java
tcp6 70962 0 10.66.88.26:57103 10.0.3.81:443 ESTABLISHED 18968/java

[Arie Skliarouk (skliarie)]

My suspicions proved wrong - I disabled ipv6 by doing following:
cat >/etc/sysctl.d/40-noipv6.conf <<ENDOFIPV6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.eth0.disable_ipv6 = 1
net.ipv6.conf.eth1.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.vboxnet0.disable_ipv6 = 1
ENDOFIPV6

.. and after reboot, the javaws still spends many minutes until I get the application's screen (if at all).

For what it worth, the application in question is IPMI as provided by SuperMicro daughterboards.