problem when allocating port with openjdk6

Kurt Miller kurt at
Thu Dec 9 11:09:55 PST 2010

On 12/06/10 11:35, Christos Zoulas wrote:
> On Dec 6,  8:26am, glewis at (Greg Lewis) wrote:
> -- Subject: Re: problem when allocating port with openjdk6
> | Try adding '' to the args that are passed
> | to the JVM on start up.
> Yes, java seems to prefer to use IPv6 mapped addresses for IPv4. But this
> does not explain why:
> sysctl -w net.inet6.ip6.v6only=0
> does not work.
> Not that I am suggesting to change the sysctl, because of the security
> implications. On the other hand, what's the longer term plan for this?
> Should we default the preferIPv4Stack to true for the BSD builds?

Hi Christos,

On OpenBSD, I disable IPv6 by default in the build using
DONT_ENABLE_IPV6="YES". I recommend that for OSs where
IPv6 mapped addresses is disabled by default.

The long term plan would be to implement a two socket solution similar
to how the windows networking support is implemented in the JDK.


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