Error "503 Service Temporarily Unavailable" when trying to scrape bitcointalk - python-3.x

Question

I have been scraping a small amount of data once a day & the code was working before 5 days ago. Now I can't seem to get anything but a 503 error code when trying.
Here's a simple cut of the code causing the issues:
from urllib.request import Request, urlopen
website = "https://bitcointalk.org/index.php?board=1.0"
req = Request(website, headers={'User-Agent': 'Mozilla/5.0'})
data = urlopen(req).read()
print(data)
which gives the error:
Traceback (most recent call last):
File "C:/Users/Clay/Desktop/python/airdrop/1.py", line 6, in <module>
data = urlopen(req).read()
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 223, in urlopen
return opener.open(url, data, timeout)
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 532, in open
response = meth(req, response)
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 642, in http_response
'http', request, response, code, msg, hdrs)
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 570, in error
return self._call_chain(*args)
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 504, in _call_chain
result = func(*args)
File "C:\Users\Clay\AppData\Local\Programs\Python\Python36\lib\urllib\request.py", line 650, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 503: Service Temporarily Unavailable
any ideas? I am quite lost after changing the User-Agent and still having the same issue.
I also have multiple proxy servers that I've tried cycling through and it doesn't work on any of them.