I use IPV6 to configure protocal's host, like :
<dubbo:protocal host=":::" port="22660"/>
I startup application, system will validate the host and throw "IllegalStateException" by name's pattern. I think the host cannot be used by name pattern when use ipv6.

ProtocolConfig.java
public void setHost(String host) {
checkName(HOST_KEY, host);
this.host = host;
}

AbstractConfig.java.
protected static void checkName(String property, String value) {
checkProperty(property, value, MAX_LENGTH, PATTERN_NAME);
}