[erlang-questions] Unknown error while using SSL/TLS

Ingela Andin ingela.andin@REDACTED
Wed Aug 8 08:43:49 CEST 2018

Hi Amin!

2018-08-07 21:19 GMT+02:00 Amin Arria <amin.arria@REDACTED>:

> Hi everyone,
> I have an application using cowboy with SSL/TLS. For some reason it has
> stopped accepting connections and giving SSL erros to the clients
> connecting.
> The only piece of info the server gives is "TLS server: In state certify
> received CLIENT ALERT: Fatal - Illegal Parameter" and I can't find anything
> about. Do you know anything?
If you think about the wording, you would realise that it is the clients
that are sending the alerts and not the server. However it is possible that
it is due to a bug in the server, but it could also be a client problem.
Illegal Parameter
is tipically a subtle interop problem that is the client or the server is
doing something wrong so that they are not able to a agree on a shared

Without any more details about versions of OTP and the ssl application and
what cipher suites used to work it is hard to say anything more.

Regards Ingela Erlang/OTP team - Ericsson AB

> Thanks,
> Amin
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