How do I fix "socket.gaierror: [Errno -2] Name or service not known" when using paramiko?

[coderic]

I am trying to send an email in my python script via ssh. However, I keep getting

socket.gaierror: [Errno -2] Name or service not known

.
I searched google for it and found this: https://stackoverflow.com/questions/...vice-not-known, but that doesn't solve the problem, as I can connect like normal to the server using a terminal, only in Python it's not working.
I also found this source: https://www.programcreek.com/python/...ocket.gaierror, but a simple try-except won't help, if the code *always* runs into this error, not just occasionally.

The code I use:

import paramiko
hostname, sshport, username, password = splitLine
            print(splitLine)
            ssh = paramiko.SSHClient()
            ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
            ssh.connect(hostname, port=int(sshport), username=username, password=password)
 

splitLine is a line I read from a txt-File beforehand, looking like this (with actual data of course):

my_server_adress port username password
 

It is preformatted and then split into a python list: ["my_server_adress", "port", "username", "password"].
I also tried the port with and without conversion to an integer, get the same error both times.