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Re: FTPS: error 425 on connection re-use - SSL session not being re-used?

From: Daniel Stenberg <>
Date: Fri, 27 Jul 2018 17:24:45 +0200 (CEST)

On Fri, 27 Jul 2018, Ivan Pilipenko wrote:

> according to [1], the error occurs because proftpd requires the clients to
> also re-use SSL sessions if the connection is re-used. Setting the
> corresponding option in proftpd to work around the issue works, so it seems
> curl is still not re-using SSL sessions correctly. However, according to [2]
> it was supposed to be fixed back in 2016?
> Is there anything special I have to do to make libcurl also re-use SSL
> sessions, or is it still broken/not implemented? I am currently using
> libcurl 7.60 and as far as I can tell there was nothing related in the 7.61
> changelog.

I think it was fixed - the mail you link to is a confirmation that it at least
worked for someone. Maybe it broke again in a subsequent release since we have
no tests for this. Maybe it wasn't completely fixed that triggers for you.

Received on 2018-07-27