Right now Fabric8 Kubernetes Client doesn't work with IPv6 based Kubernetes Clusters due to an issue in OkHttp square/okhttp#5889. The issue is solved for OkHttp 4, but Fabric8 Kubernetes Client depends on OkHttp 3.x.
We have decided not to upgrade to OkHttp 4.x, because it's based on Kotlin (square/okhttp#4723) and this might be an issue for downstream and dependent projects .
We're still discussing a proper replacement for OkHttp (#2764, #2632). In the meantime you can switch to use OkHttp 4.x in your project by configuring 3.x exclusions and adding your own direct 4.x OkHttp dependencies (since it's binary compatible):
<properties>
<fabric8.version>5.5.0</fabric8.version>
<okhttp.version>4.9.0</okhttp.version>
</properties>
<dependencies>
<dependency>
<groupId>io.fabric8</groupId>
<artifactId>kubernetes-client</artifactId>
<version>${fabric8.version}</version>
<exclusions>
<exclusion>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
</exclusion>
<exclusion>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>logging-interceptor</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>${okhttp.version}</version>
</dependency>
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>logging-interceptor</artifactId>
<version>${okhttp.version}</version>
</dependency>
</dependencies>
You can find an example demo project here.