Redpanda Connect pipelines that read from and write to topics in the same Redpanda Cloud cluster using the redpanda_common input/output components log repeated warnings similar to:

unable to open connection to broker due to an immediate EOF, which often means the client is using TLS when the broker…

From internal reproduction, this behaviour is specific to the redpanda_common components (input/output) in Redpanda Connect. 

There was a bug in the implementation of redpanda_common in Redpanda Cloud where one of the seed brokers could be mishandled, leading to spurious TLS‑related connection warning…

redpanda_common component  has been marked as deprecated since version  4.68.0 of redpanda connect.
To eliminate the noisy TLS EOF warnings and use the supported path going forward:

1. Migrate from redpanda_common to the unified redpanda inputs / outputs components  
2. make use of contextual variables for the broker on the redpanda inputs / outputs for seed_brokers
 

- The warnings are cosmetic in this scenario: data flow continues to work, but they clutter logs and can obscure real issues.

- Because redpanda_common is deprecated and scheduled for removal, new and existing pipelines should be migrated to the unified redpanda input/output components to stay on a supported path and avoid this log spam.