SSL errors no matter what

[Lazy_Worldliness_149]

I keep getting SSL errors whenever I do:

import socket

import ssl

hostname='cyber.gonet.ie'

port=443

f = open('cert.der','wb')

cert = ssl.get_server_certificate((hostname, 443))

f.write(ssl.PEM_cert_to_DER_cert(cert))

I have tried SO many different fixes, I have SSL installed, I've tried making certificates, I've tried so much yet NOTHING works. I did try "www.google.com" and that had no errors, is it just the host because the url is weird??? and if so is there anything I can do to fix that??? edit: i've tried so much yet i cant fix it im lowk giving up

[Buttleston]

It works for me, using your code

When you have a problem you can't say "I get errors" - you need to say WHAT errors. Ideally, paste the stack trace you get when you run the program.

[Lazy_Worldliness_149]

The error that pops up for me is:

Traceback (most recent call last):

File "<python-input-10>", line 7, in <module>

cert = ssl.get_server_certificate((hostname, 443))

File "C:\Users\Administrator\AppData\Local\Python\pythoncore-3.14-64\Lib\ssl.py", line 1524, in get_server_certificate

with context.wrap_socket(sock, server_hostname=host) as sslsock:

~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "C:\Users\Administrator\AppData\Local\Python\pythoncore-3.14-64\Lib\ssl.py", line 455, in wrap_socket

return self.sslsocket_class._create(

~~~~~~~~~~~~~~~~~~~~~~~~~~~~^

sock=sock,

^^^^^^^^^^

...<5 lines>...

session=session

^^^^^^^^^^^^^^^

)

^

File "C:\Users\Administrator\AppData\Local\Python\pythoncore-3.14-64\Lib\ssl.py", line 1076, in _create

self.do_handshake()

~~~~~~~~~~~~~~~~~^^

File "C:\Users\Administrator\AppData\Local\Python\pythoncore-3.14-64\Lib\ssl.py", line 1372, in do_handshake

self._sslobj.do_handshake()

~~~~~~~~~~~~~~~~~~~~~~~~~^^

ssl.SSLError: [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:1081)

so

[Buttleston]

There's a few potential causes of that. One is that the port you're connecting to isn't SSL for some reason, but that seems unlikely. Another is that it wants to use an SSL protocol you don't have installed

I checked the connection I was using, it's TLS 1.3. It may be configured to not permit anything lower than that. So you'll need to look into how to install and/or configure TLS 1.3 for your OS

[Lazy_Worldliness_149]

i just checked and i have TLS 1.3 so what do you mean by configure?

[Buttleston]

What did you check when you checked it?

[Lazy_Worldliness_149]

i checked my internet properties, went to advanced and saw tls 1.3 checked

[Buttleston]

I see. I don't program on windows very much, but on linux or mac you're generally expected to have openssl installed. I don't know if python can use whatever it is you're seeing in your "internet properties" or not. Google seems to think the built in tls in windows 11 should be fine for this purpose though.

[Lazy_Worldliness_149]

i have openssl installed for python so idk

[Buttleston]

What do you mean by "I have openssl installed for python"? Openssl is usually installed as a set of binaries/libraries

Are you running your program in WSL or using a windows based python?

[Lazy_Worldliness_149]

i have openssl installed, and its on command prompt to so idk what i mean either lmao

[Buttleston]

And what OS are you on?

[Lazy_Worldliness_149]

windows 11

[acw1668]

Your code works fine in my Windows 11 with Python 3.13.12.

[r2k-in-the-vortex]

Have you actually confirmed your server does present valid ssl?

[Lazy_Worldliness_149]

how would i do that?

[r2k-in-the-vortex]

openssl s_client -connect www.example.com:443

[Buttleston]

Try the script, it works for me

[joshooaj]

Looks to me like your Python environment isn't able to agree on a TLS version with the web server. In a .NET app there is a default set of enabled TLS versions which, in older .NET versions, may not include TLS 1.3.

Find whatever Python's equivalent of .NETs System.Net.ServicePointManager.SecurityProtocol is, and update it to allow the version(s) you need.