Testing ports through firewall

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Hello Community, and Merry Christmas/Happy Seasons Greetings,
   anyway, I need some help with understanding an openssl feature - s_server.

I executed the following command:  openssl s_server -accept 21937 -www &
And immediately got the following output:
[1] 3286
[sysadm@wfrench-rhel6c-cit ~]$ Error opening server certificate private key file server.pem
140679739017032:error:02001002:system library:fopen:No such file or directory:bss_file.c:398:fopen('server.pem','r')
140679739017032:error:20074002:BIO routines:FILE_CTRL:system lib:bss_file.c:400:
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 thing?
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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