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https://issues.apache.org/jira/browse/SOLR-7293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376030#comment-14376030
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Uwe Schindler commented on SOLR-7293:
-------------------------------------

I agree this is an issue. It is caused by the "bin/solr" and "bin/solr.cmd" 
command, it passes: {{-Djava.net.preferIPv4Stack=true}} to the JVM (for no 
reason). The fix is to remove this incorrect setting. This affects borth the 
windows and also the linux/posix startup script.

We should simply remove this. I did not know that we have added this, otherwise 
I would have complained already!

> Install script makes solr not listen on ipv6 socket
> ---------------------------------------------------
>
>                 Key: SOLR-7293
>                 URL: https://issues.apache.org/jira/browse/SOLR-7293
>             Project: Solr
>          Issue Type: Improvement
>          Components: Build
>    Affects Versions: 5.0
>         Environment: Centos 7
>            Reporter: Sebastian Pesman
>              Labels: ipv6, sockets
>
> When installing solr with the install script (documentation 
> https://cwiki.apache.org/confluence/display/solr/Taking+Solr+to+Production) 
> the process only listens on an IPv4 socket. > *8983
> When manually installing with the same software set but running the software 
> via a tomcat startup it does listen on ipv4 and IPv6 sockets. > :::8080
> I do realize that I have different ports, it's about 2 servers. I 
> intentionally did not change port of the IPv6 only server to be exact and 
> presize and maybe running it via Tomcat affects this.
> {quote}
> vim /etc/tomcat/web.xml
>     <env-entry> 
>        <env-entry-name>solr/home</env-entry-name> 
>        <env-entry-value>/home/solr</env-entry-value> 
>        <env-entry-type>java.lang.String</env-entry-type> 
>     </env-entry>
> cp /tmp/solr-5.0.0/server/webapps/solr.war /var/lib/tomcat/webapps/
> service tomcat start
> {/quote}



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