Frequently Asked Questions

FAQ is moving to Stack Overflow

The preferred support channel on which the Hono community would like to receive questions from users and answer them is Stackoverflow. There is the special tag [eclipse-hono], that the Hono developers keep watching. This FAQ page here will be removed soon.

Why do I get HTTP/1.1 503 Service Unavailable when sending messages to the HTTP protocol adapter?

See the accepted answer on Stackoverflow.

Why do I get the exception io.vertx.core.VertxException: OpenSSL is not available during startup of a protocol adapter?

See the accepted answer on Stackoverflow.

Why do I see ConnectionLimitManager - Connection limit (<VALUE>) exceeded in the logs of a protocol adapter?

See the accepted answer on Stackoverflow.

Why do I see MemoryBasedConnectionLimitStrategy - Not enough memory in the logs of a protocol adapter?

See the accepted answer on Stackoverflow.

How do I use client certificates for authentication?

See the accepted answer on Stackoverflow.