After installing RHUI4, login fails with rhui-manager.

Issue

After installing RHUI4, login fails with rhui-manager.
username/password is correct.

# rhui-manager
<snip>
RHUI Username: admin
RHUI Password:
Invalid login, please check the authentication credentials and try again.


# less /root/.rhui/rhui.log

<snip>
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/rhui/tools/launcher.py", line 136, in _pulp_api
    auth.login(pulp_api, prompt)
  File "/usr/lib/python3.6/site-packages/rhui/tools/auth.py", line 71, in login
    cookies = _login(pulp, prompt)
  File "/usr/lib/python3.6/site-packages/rhui/tools/auth.py", line 127, in _login
    credentials = pulp.login(username, password)
  File "/usr/lib/python3.6/site-packages/rhui/tools/pulp_api.py", line 250, in login
    raise RhuiException(error_code=error_codes.RHUI0006, message=str(e), host=auth_url)
rhui.common.exceptions.RhuiException: Failed to connect to http://localhost:24817/auth/login/: HTTPConnectionPool(host='<proxy-server>', port
=8080): Max retries exceeded with url: http://localhost:24817/auth/login/ (Caused by ProxyError('Cannot connect to proxy.', NewConnectionErro
r('<urllib3.connection.HTTPConnection object at 0x7fc83dd72588>: Failed to establish a new connection: [Errno 113] No route to host',))).
2022-09-26 18:39:58,691 - Connecting to RHUA [http://localhost:24817]...
2022-09-26 18:40:01,357 - No CSRF middleware token found in HTTP response body.
2022-09-26 18:40:01,752 - Connecting to RHUA [http://localhost:24817]...
2022-09-26 18:40:02,161 - Successfully connected to [http://localhost:24817].