Invalid client_id size

[SunSparc]

If I am seeing messages similar to the following in the server logs, should I be concerned? The INFO tag indicates that it is informational.

INFO  2025-10-22 18:41:15,418 [shard 0:main] kafka - server.cc:181 - Disconnected 10.254.0.24:14354
  (applying protocol, parse error: Invalid client_id size -11290)

[dotnwat]

We see this occassionally, and it can be worth investigating.

1. Is your application otherwise running normally? Are you clients observing errors?
2. Is 10.254.0.24:14354 an expected IP for your client?
3. What is the exact client and client verison you are using?

We have seen cases where this error occurs because of a buggy client as well as cases where non-kafka clients were connecting to the cluster (e.g. network security scanners).

[SunSparc]

Thanks. I will dig a bit deeper and see if it is actually a problem.