Can you try opening a socket with netcat on localhost? nc -lk 9000
and see it this works? For me this works. -- Jonas -- View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Connection-refused-error-when-writing-to-socket-tp11372p11376.html Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com.