pose_from_rcsb error

I am a newbie with very little experience with linux, conda, python, or pyrosetta. The COVID-19 lockdown finally gave me the time to set this up and start to learn it. I finally have pyrosetta running in a conda python 3.7 environment - I can load pose_from_pdb, clean it, edit it, and view in pymol. But pose=pose_from_rcsb gives the following error: "cannot access network resource, make sure you are connected to the internet". See the traceback below. I am connected to the internet (I posted this message from the same computer). What's the matter? Is there something I need to do in python or pyrosetta to connect to the internet? Thanks.

>>> from pyrosetta.toolbox import pose_from_rcsb
>>> pose = pose_from_rcsb("5OYB.pdb")
Traceback (most recent call last):
  File "/home/criss/anaconda3/lib/python3.7/site-packages/pyrosetta/toolbox/rcsb.py", line 36, in download_from_web
    temp = urllib_urlretrieve(url)[0]
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 247, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/criss/anaconda3/lib/python3.7/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/criss/anaconda3/lib/python3.7/site-packages/pyrosetta/toolbox/rcsb.py", line 95, in pose_from_rcsb
    load_from_rcsb(pdb_code)
  File "/home/criss/anaconda3/lib/python3.7/site-packages/pyrosetta/toolbox/rcsb.py", line 70, in load_from_rcsb
    with download_from_web(pdb_url) as pdb_data:
  File "/home/criss/anaconda3/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/home/criss/anaconda3/lib/python3.7/site-packages/pyrosetta/toolbox/rcsb.py", line 39, in download_from_web
    "Cannot access network resource, please check your Internet access."
OSError: Cannot access network resource, please check your Internet access.