MQTT module connection query in ignition 7.9

Tried to establish the MQTT connection between PC.
First PC contains Sparkplug MQTT client
Second PC contains Ignition platform with installed MQTT distributor.
Third PC contains Ignition platform with installed MQTT engine and Ignition launch designer(Like dashboard)

Configured the Second PC MqTT distributor IP address in First PC and Third PC.

issue is,

MQTT connection between second PC and Third PC is done and able to see wire shark logs and also first PC and third PC connection also established. But the connection between first PC and Second PC is failed.

Could you please your input and feedback on the same.