Hi, Do you have redundancy configured and what is your application redundancy configuration - active/active or active/standby? Do you have in the connection hosts all the server IPs for the redundancy pair? Do you see in the java console/log whether the API is trying to reconnect and to which broker? Those should help you detect the problem. Normally, since you’re setting the reconnectRetries to -1, the API should try to reconnect. Here is a document explaining how it works and which parameter does what: