How Configuration Affects Agent to Enterprise Manager Connections

When agents are configured to be allowed or disallowed on Enterprise Managers, the Enterprise Manager can take various actions when the agents request connection. The Enterprise Manager can accept the connection or deny the connection. When the Enterprise Manager accepts the connection request, the agent can connect in one of two ways:
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When agents are configured to be allowed or disallowed on Enterprise Managers, the Enterprise Manager can take various actions when the agents request connection. The Enterprise Manager can accept the connection or deny the connection. When the Enterprise Manager accepts the connection request, the agent can connect in one of two ways:
  • Connect actively and send metrics data to the Enterprise Manager.
  • Connect passively and send no data.
When the Enterprise Manager denies the connection request, the agent behavior varies depending on its version.
Based on the agent version and the allowed and disallowed configuration, the Enterprise Manager can take three actions. These actions can result in four agent connections states. Two of these states result in the agent displaying in the APM Status console Denied Agents list.
Agent Version
Allowed/Disallowed Configuration
Enterprise Manager Action Upon Connection Request
Resulting Agent Connection State
Displays in APM Status Console Denied Agents List
9.1 and later
Allowed
Active Connection Accepted
Connected-agent actively sending data
No
Pre-9.1
Allowed
Active Connection Accepted
Connected-agent actively sending data
No
9.1 and later
Disallowed
Connection Denied
Disconnected
Yes
9.1 and later
Disallowed
Passive Connection Accepted
Connected-agent passive; not sending data
Yes
Pre-9.1
Disallowed
Connection Denied
Disconnected-agent retrying to connect
Yes