While configuring your first Simulation Bot, you may get the following error message on the Console Output of the Bot.

ERROR: sasl_ssl://<server>:29092/bootstrap: Connection to ip4#server.29092 failed: No connection could be made because the target machine actively refused it

The error message is a bit misleading (Kafka error message). It is not the OE Appliance which refuses the connection, it is your firewall configuration which does not allow the bot to connect via TCP 29092 to the OE Appliance.
For this reason, make sure that TCP ports 29092 and TCP 22181 are open in both directions between your Bot Clients and the OE Appliance.