Per email thread from the messaging list, the example config in section 14.1. Connection Time-To-Live assumes the value is in seconds, but it should be in milliseconds.

Email:
The problem is this setting:
<connection-ttl-override>30</connection-ttl-override>
Here you're telling the broker to override the TTL on every connection to 30 milliseconds. I think what you really want to use here is:
<connection-ttl-override>30000</connection-ttl-override>
I looked at the documentation [1] and the value is documented incorrectly there as well.

[1] https://access.redhat.com/documentation/en-us/red_hat_jboss_amq/7.1/html/using_amq_broker/dead_connections#connection_time_to_live