I need to use the Confluent kafka-avro-serializer Maven artifact. From the official guide I should add this repository to my Maven pom
The file is available, since you can download it if you go to it directly: http://packages.confluent.io/maven/io/confluent/kafka-avro-serializer/3.1.1/kafka-avro-serializer-3.1.1.jar
You could try adding the -U flag to your maven command to force download of cached files.
The root of the repo isn't browsable which is why you are getting the message when browsing to http://packages.confluent.io/maven/