This is what the Apache error log shows:
[Mon Apr 20 20:40:32.719986 2020] [wsgi:error] [pid 24934:tid 139866966574848] [remote
141.58.21.12:59320] ipa: INFO: 401 Unauthorized: HTTPSConnectionPool(host='Xipa',
port=443): Max retries exceeded with url: /session/cookie (Caused by
NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at
0x7f3551df4090>: Failed to establish a new connection: [Errno -2] Name or service not
known'))