When CONFIG_REDIS_SENTINEL_HOSTS and CONFIG_QUEUES_SENTINEL_HOSTS value include only the host of the sentinel hosts (e.g. host1,host2,host3), *backend-cron* and *backend-worker* give the error message:

TypeError: can't convert nil into Integer".

*backend-listener* doesn't fail on start, but that's because it doesn't make any calls to Redis until it starts serving traffic.

The request is to fall back to the default sentinel port: 26379 if the port is not specified explicitly.

The documentation though should recommend to always specify the port – to be inlcuded in THREESCALE-1000(https://issues.jboss.org/browse/THREESCALE-1000).