[openssl-users] Testing ports through firewall
Sai Teja Chowdary
asteja.chowdary.ece13 at iitbhu.ac.in
Thu Dec 21 15:30:00 UTC 2017
You can test ports with OpenSSL. But you gotta need a certificate for your
s_server. You can generate a self signed certificate with openssl.
And place that file in the dir were you are running the s_server command,
or can use -cert argument to give the generated certificate.
And from the s_client connect to the port that you are listening with
openssl s_client -connect hostname:port
openssl s_server -accept PORT
On 21-Dec-2017 7:07 PM, "warron.french" <warron.french at gmail.com> wrote:
> Hello Community, and Merry Christmas/Happy Seasons Greetings,
> anyway, I need some help with understanding an openssl feature -
> I executed the following command: openssl s_server -accept 21937 -www &
> And immediately got the following output:
>  3286
> [sysadm at wfrench-rhel6c-cit ~]$ Error opening server certificate private
> key file server.pem
> 140679739017032:error:02001002:system library:fopen:No such file or
> 140679739017032:error:20074002:BIO routines:FILE_CTRL:system
> unable to load server certificate private key file
> In order to test ports that are not encrypted with SSL/TLS do I still have
> to generate a certificate and private key file (each)?
> I would like to test ports from one machine using openssl s_client against
> a remote machine on an opposing network, running a "listener", using
> openssl s_server.
> Perhaps I am way off? I am not allowed to use openssl for this sort of
> Any guidance would be greatly appreciated because I want to expand my
> understanding of the openssl suite of commands and its offerings.
> Have a nice day,
> Warron French
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