Customer was attempting to set up TLS encrypted communication for Kafka connector, when asked to provide LogLevel=5 logs, we received this:

2025/06/17 17:16:12.732209 Received item with ID 9166774
2025/06/17 17:16:12.732226 Received item with ID 6209734
2025/06/17 17:16:12.732240 Received item with ID 32329714
2025/06/17 17:16:12.732265 failed handle request, Failed to read request: failed to decode incoming item data: unexpected EOF.
2025/06/17 17:16:15.728802 Received shutdown signal
2025/06/17 17:16:15.728838 shutting down the server
2025/06/17 17:16:15.728904 shutting down the kafka producer
2025/06/17 17:16:15.729015 Server shut down, good bye!

The Kafka connector appears to be receiving values from the Zabbix Server, but is not forwarding them to Kafka instance.
Successful LogLevel=5 logs would look like this:

2025/06/18 11:26:27.441212 Received item with ID 33027
2025/06/18 11:26:27.441399 new message produced with id: 33027

This ticket goes in combination with this feature request, because the logs currently do not indicate whether this is an issue related to TLS or anything else.

Based on their TLS configuration in the Kafka connector configuration file, it appears correct, and should be working, but due to the logs not providing much useful information, continuing this troubleshooting is difficult.

Enlisting the help of developer team, as currently the trail in this investigation has gone cold.