@Quang_Vu_Blog
As per kafka-connect docs the default port "rest.port" is 8083
- rest.port - the port the REST interface listens on for HTTP requests
So are you getting conflict on port 8003 (or there is a typo ? is it 8083)
Can you try changing the "rest.port" in your worker config to something else and then try again.
Also please try to run the below commands before starting kafka-connect to verify if there is any port conflict? Or if there are any bind address issue
# netstat -tnlpa | grep 8083
# netstat -tnlpa | grep 8003
.