Error with STOMP client causing 'candlepin_events' to enter a failed state

Issue

The candlepin_events process is currently in a failed state.

candlepin_events: 
    Status:          FAIL
    message:         Not running
    Server Response: Duration: 0ms

The below error is being observed on /var/log/candlepin/error.log:

2021-03-17 13:38:50,666 [thread=Thread-8 (activemq-netty-threads)] [=, org=, csid=] WARN  org.apache.activemq.artemis.core.protocol.stomp - AMQ332069: Sent ERROR frame to STOMP client /127.0.0.1:36718: Security Error occurred: User name [null] or password is invalid

2021-03-17 13:39:05,842 [thread=Thread-9 (activemq-netty-threads)] [=, org=, csid=] WARN  org.apache.activemq.artemis.core.server - AMQ222216: Security problem while authenticating: AMQ229031: Unable to validate user from /127.0.0.1:36726. Username: null; SSL certificate subject DN: CN=localhost, OU=SomeOrgUnit, O=candlepin, ST=North Carolina, C=US

2021-03-17 13:39:05,842 [thread=Thread-9 (activemq-netty-threads)] [=, org=, csid=] WARN  org.apache.activemq.artemis.core.protocol.stomp - AMQ332069: Sent ERROR frame to STOMP client /127.0.0.1:36726: Security Error occurred: User name [null] or password is invalid

2021-03-17 13:39:21,033 [thread=Thread-10 (activemq-netty-threads)] [=, org=, csid=] WARN  org.apache.activemq.artemis.core.server - AMQ222216: Security problem while authenticating: AMQ229031: Unable to validate user from /127.0.0.1:36730. Username: null; SSL certificate subject DN: CN=localhost, OU=SomeOrgUnit, O=candlepin, ST=North Carolina, C=US

• # satellite-maintain service restart fails with:

  Check whether all services are running using the ping call:           [FAIL]
  Couldn't connect to the server: undefined method `to_sym' for nil:NilClass