Describe the problem/error/question
I installed a RabbitMQ version 4.1.0 and was not able to establish a successful connection with n8n.
What is the error message (if any)?
When saving the connection settings and testing the connection, n8n responds with:
Couldn’t connect with these settings
read ECONNRESET
The RabbitMQ log gives more insight:
error: FORMATTER CRASH: {“closing AMQP connection ~tp (~ts):~nfailed to negotiate connection parameters: ~ts”,[<0.634.0>,<<“10.0.1.34:37498 → 10.0.1.46:5672”>>,“3s”,“negotiated frame_max = 4096 is lower than the minimum allowed value (8192)”]}
According to ChatGPT, here is the problem:
In RabbitMQ 4.1.0, the minimum acceptable frame_max value during the connection negotiation phase was increased from 4096 bytes to 8192 bytes. This change was implemented to accommodate larger JWT tokens during authentication. As a result, clients that attempt to negotiate a frame_max value lower than 8192 bytes will have their connections rejected .
So unless you have covered this problem in a newer version (which I did not find in the changelog), you need to updated the related libraries, so that n8n is able to connect to RabbitMQ version 4.1.0. Until you resolve that, I will downgrade RabbitMQ to an older version.
Information on your n8n setup
- n8n version: 1.75.2
- Database (default: SQLite): Postgres
- n8n EXECUTIONS_PROCESS setting (default: own, main): queue
- Running n8n via (Docker, npm, n8n cloud, desktop app): docker
- Operating system: Linux