SSL Installation with certbot; problems

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Hello all,

Firstly, I'm a bit of a beginner so please be as patient as you can.

I set up a practice website that sent data collected from a form to a database. It worked.

I then tried to install an SSL certificate for better security. Unfortunately it didn't work (when typing URL my browser couldn't open the page). I then discovered certbot and used this to attempt to install an SSL certificate. It doesn't work now. As I didn't make the changes myself I can't go back and undo them. To be specific, when I type my domain into the browser it shows me this (in Chrome):

"This site can't provide a secure connection" and "ERR_SSL_PROTOCOL_ERROR".

Would somebody be willing to help?

So far I have this from openssl (sorry if it formats terribly, like I said; beginner):

james@localhost:~$ openssl s_client -connect www.mydomain.com:443
CONNECTED(00000003)
140444419827352:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:794:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 7 bytes and written 305 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : 0000
    Session-ID:
    Session-ID-ctx:
    Master-Key:
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1495028612
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)

I'm running Ubuntu 16.04 and Apache 2.4.18 (Ubuntu).

If anybody could help me I would really appreciate it. I only did the SSL stuff this morning and I have heard it could take up to 24 hours to work, but still...

Thanks,
James

PS: If there is a more suitable list I can contact, please let me know.


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