No services available when VPN is connected

[Grizmol]

When service is registered on VPN connected, no service is visible.

Sample code to reproduce error

package com.company;
import java.io.IOException;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.Map;
import javax.jmdns.JmDNS;
import javax.jmdns.ServiceInfo;

public class Main {

    public static void main(String[] args) {
        try {
            System.setProperty(org.slf4j.impl.SimpleLogger.DEFAULT_LOG_LEVEL_KEY, "TRACE");

            // Wait a bit

            String serviceType = "_testservice._tcp.local.";

            JmDNS jmdns = JmDNS.create();

            ServiceInfo discoveryServiceInfo = getDiscoveryServiceInfo(serviceType);
            jmdns.registerService(discoveryServiceInfo);

            System.out.println("Press q and Enter, to quit");
            int b;
            while ((b = System.in.read()) != -1 && (char) b != 'q') { }
            jmdns.unregisterAllServices();
            jmdns.close();

            System.out.println("Done");
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }

    private static ServiceInfo getDiscoveryServiceInfo(String serviceType) {
        // Register a service
        Map<String, String> discoveryData = new HashMap<>();

        discoveryData.put("TestKey", "TestValue");

        return ServiceInfo.create(serviceType, "TestService", 20480, 1, 1, discoveryData);
    }

}

Expected result Add record should be visible when typing in terminal: dns-sd -B _testservice

Actual error There is no record visible when connected to vpn.

Additional info When registering a service with

dns-sd -R "Test service instance" _testservice._tcp local 30

everything works fine. Not every VPN causes this issue. Creating same service data with alternative javascript library also works correct.

Environment jmdns : 3.5.5 macOS: Mojave 10.14.6 (18G103) vpn client: Pulse Secure

[melloware]

I am pretty sure JmDNS jmdns = JmDNS.create(); you need to use the overloaded create() to pass the IP address or you want to scan because once you have a VPN you now have multiple Network Adapters.