<p></p>
<p><b>@jmacxx</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/4045#discussion_r393795357">common/src/main/java/bisq/common/setup/CommonSetup.java</a>:</p>
<pre style='color:#555'>> +
+        // #3990 allow IPv6 custom Bitcoin node in settings by hostname
+        System.setProperty("java.net.preferIPv6Addresses", "true");
</pre>
<p>I have not seen any drawback from setting this, even if IPv6 is not available.  Here's a <a href="https://docs.oracle.com/javase/1.5.0/docs/guide/net/ipv6_guide/index.html" rel="nofollow">document</a> on the subject, which mentions setting the property.  And <a href="https://stackoverflow.com/questions/20262587/where-to-set-java-net-preferipv6addresses-true#20262705" rel="nofollow">another one</a> which mentions that the setting has to be made very early in app startup.</p>
<p>If you think its too risky we can revert to choosing between IPv4 and IPv6 addresses in BtcNodeConverter where it creates a PeerAddress from hostname.</p>

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