KafkaException error when using MessageHub Service

Question

Using the Message Hub service recently, I have discovered that previously working apps have begun failing with a KafkaException or Failed to update metadata.

How do I fix this?

Answer 1

As of the 3rd March, port 9094 has been switched off, as documented in the MessageHub docs:

https://console.ng.bluemix.net/docs/services/MessageHub/index.html#messagehub063

and the correct port to use instead is port 9093. Misuse of the 9094 port has been known to cause the above errors.