Hi,
you should be able to log into the Felix console for a standby instance. Looking at your logs, it seems there is an issue with your standby instance as identified by the line:
11.05.2016 05:28:42.361 *ERROR* [qtp2116318846-204] org.apache.sling.engine.impl.SlingHttpContext handleSecurity: AuthenticationSupport service missing. Cannot authenti
cate request.
The above is a symptom of the problem and not the root cause. I would check the error.log file and check to see which exception occurs during the startup of your instance.
Regards,
Opkar