ssl client write / server accept seems broken

Matt Caswell matt at
Tue Mar 23 14:31:00 UTC 2021

On 23/03/2021 02:37, Embedded Devel wrote:
> I have an application previously written for us 10+ years ago that no 
> longer seems to be happy

Has something happened that might have caused this? Did you upgrade 
OpenSSL, or do some other kind of update to your code?

Which version of OpenSSL are you using?

> and the original dev is no  longer available, so who can i pay to bang 
> this out and make it happy, or who can guide me through getting it 
> functional... basic info below.
> I have a client process which is supposed to speak to a server via ssl, 
> and then send data
> Ive created a "CA" and generated the CSR / and certs for both the client 
> and the server.

What kind of certs did you generate? How big are the keys? Are you able 
to share the certs (not the keys)?

> when i run the client - i get an error on the client side
> Tue Mar 23 02:13:58 2021 user.err : ac_ssl_client_write(): Error 
> SSL_ERROR_SSL - return code: -1.
> Tue Mar 23 02:13:58 2021 : ac_send_init(): Error

It would be useful to see any errors on the OpenSSL error stack which 
might provide more details about specifically what has failed. For 
example you can call the `ERR_print_errors_fp` function to dump the 
error stack to a `FILE *`. Or alternatively use the `ERR_*` functions to 
examine the stack and print it to your log:


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