Please have some respect towards the time of individuals on this list and help them help you by posting more details: what are you trying to do? How many channels
are there in the system according to the management UI? What client is used? Of what version? What RabbitMQ version? What's in the server logs?
How can this be reproduced with a small code example?
Most likely your application uses more channels that the client (or possibly the server, although we have no evidence of that and that's not an
error RabbitMQ itself logs when max channel limit is exceeded) is configured to allow.
However, I am not aware of a client that logs that specific message.
[1] is relevant here. Default channel_max in RabbitMQ 3.7.7 is 2047.