Program works with older libssl, but not with newer

Christoph Pleger Christoph.Pleger at
Tue Mar 31 14:51:32 UTC 2020


> > I have here a self-written server program and the corresponding
> > self-written client program. These run well together with libssl 1.1.0l,
> > but with libssl 1.1.1d, the same programs give errors SSL_ERROR_SYSCALL
> > in SSL_read(), no matter if I recompile the programs and then run them,
> > or just replace libssl with the newer version.
> OpenSSL 1.1.1 supports TLS 1.3, which OpenSSL 1.1.0 did not.
> > So, I want to ask if there are any known incompabilities in the libssl
> > versions that require me to change the code of the programs, or if there
> > is
> > any known bug in libssl1.1.1d that may cause the mentioned errors.
> Use of TLS 1.3 changes the communication patterns of the TLS protocol in
> some non-trivial ways, and, if your application were fragile, it might
> have gotten by with TLS 1.2, but the latent bugs could show up with TLS
> 1.3.

Now, I replaced TLS_server_method() and TLS_client_method() with 
TLSv1_2_server_method() and TLSv1_2_client_method() respectively, and the same 
error occurs. 


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