The following errors may cause managers (schedulers) to think agent is down or not responsive.
TCP/IP Controller Plugin.Receiver pool thread <Regular:2>.CybReceiverChannel.receive[:158] - Conversation from 10.10.XX.XX:30001 to 10.10.XX.XX:7520 arrived
05/21/2018 12:37:XX.XXX 1 TCP/IP Controller Plugin.Receiver pool thread <Regular:2>.CybReceiverChannel.receive[:234] - cybermation.library.communications.CybConversationException:
Unexpected encryption type. DES received. AES expected.
at cybermation.library.communications.protocol.CybCommunicationProtocolRevisionTwo.receiveData(CybCommunicationProtocolRevisionTwo.java:567)
......snip.........
at cybermation.library.communications.CybConversation.receiveMessage(CybConversation.java:458)
at cybermation.commplugins.tcpip.receiver.CybReceiverChannel.receive(CybReceiverChannel.java:174)
at cybermation.commplugins.tcpip.receiver.CybReceiverChannel.call(CybReceiverChannel.java:139)
at cybermation.commplugins.tcpip.receiver.CybReceiverChannel.call(CybReceiverChannel.java:51)
The error indicates that the CA Agent received an incorrect encryption from the manager. If you have recently updated the agent and started receiving these errors, then check to make sure that Agent name, port, and encryption have been properly updated on the manager side.