Thanks, Pekka. But we know from an earlier post from Srinivas that the driver is trying to negotiate with v4 but the node wouldn't:
[2021-07-09 23:26:52.382 -0700] <cluster1-nio-worker-1> com.datastax.driver.core.Connection - DEBUG: Got unsupported protocol version error from /<ip>:<port> for version V4 server supports version V3 [2021-07-09 23:26:52.382 -0700] <cluster1-nio-worker-1> com.datastax.driver.core.Connection - DEBUG: Connection[//<ip>:<port> -1, inFlight=0, closed=true] closing connection [2021-07-09 23:26:52.382 -0700] <cluster1-nio-worker-1> com.datastax.driver.core.Host.STATES - DEBUG: [//<ip>:<port>] Connection[/10.39.38.166:9042-1, inFlight=0, closed=true] closed, remaining = 0 [2021-07-09 23:26:52.383 -0700] <main> com.datastax.driver.core.Cluster - DEBUG: Cannot connect with protocol V4, trying V3 So we know it's just the one problematic node in the cluster which won't negotiate. The SHOW VERSION in cqlsh also indicates v3 but I can't figure out what could be triggering it. Cheers!
