Kafka Agents disconnecting intermittently

Products

• CA Application Performance Management (APM / Wily / Introscope)

Issue/Introduction

Kafka Agents disconnecting intermittently. In the IntroscopeAgent.logs, we are seeing messages like below:

There are close to 9000 agents connected in our tenant without any problem. Can you specifically tell us what's the difference between disallowed mode and allowed mode?

 [INFO] [IntroscopeAgent.ConnectionThread] Connected to <host>.com:443,com.wily.isengard.client.transport.websocket.SSLWebSocketFactory in disallowed mode

[INFO] [IntroscopeAgent.ConnectionThread] Connected to <host>com:443,com.wily.isengard.client.transport.websocket.SSLWebSocketFactory in disallowed mode.

Resolution

So, an agent can be in a state where it starts up but does not show up in the Metric Browser/Investigator. This is a disallowed state.and denied to connect to the EM. Eventually , it should return to an allowed state

There are a variety of reasons that this can happen such as clamps, version incompatibilities 
. A very good explanation is in the documentation link below:

What to do when an agent is denied