ok thanks! MQTT explorer is a behaving like a standard MQTT client, means it tries to send a message by MQTT over TLS via port 8883 to the IP address of the ctrlX. If you cannot connect that means that something on the way is blocked. Since it works on your home laptop, I fear that you have to talk to the Bosch IT to get it sorted out. One thing you can try: go to test.mosquitto.org. Try to connect to test.mosquitto.org with your MQTT Explorer on your work laptop. Let me know if you can connect.
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