Random ValueError for invalid IP address

[jrecasens]

While running my app in Azure Web Apps I get the following random message:

2023-02-01T14:43:52.351399543Z 2023-02-01 09:43:52,332 - main - ERROR - Exception on /favicon.png [GET]
2023-02-01T14:43:52.351437144Z Traceback (most recent call last):
2023-02-01T14:43:52.351444244Z   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2077, in wsgi_app
2023-02-01T14:43:52.351449044Z     response = self.full_dispatch_request()
2023-02-01T14:43:52.351453344Z   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1526, in full_dispatch_request
2023-02-01T14:43:52.351458044Z     return self.finalize_request(rv)
2023-02-01T14:43:52.351462144Z   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1547, in finalize_request
2023-02-01T14:43:52.351466744Z     response = self.process_response(response)
2023-02-01T14:43:52.351470744Z   File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1889, in process_response
2023-02-01T14:43:52.351475044Z     response = self.ensure_sync(func)(response)
2023-02-01T14:43:52.351479244Z   File "/usr/local/lib/python3.9/site-packages/flask_ipban/ip_ban.py", line 116, in _after_request
2023-02-01T14:43:52.351483544Z     self.add()
2023-02-01T14:43:52.351487544Z   File "/usr/local/lib/python3.9/site-packages/flask_ipban/ip_ban.py", line 378, in add
2023-02-01T14:43:52.351501344Z     if self.test_pattern_blocklist(url, ip=ip):
2023-02-01T14:43:52.351525244Z   File "/usr/local/lib/python3.9/site-packages/flask_ipban/ip_ban.py", line 194, in test_pattern_blocklist
2023-02-01T14:43:52.351529244Z     ip_address = ipaddress.ip_address(ip)
2023-02-01T14:43:52.351550845Z   File "/usr/local/lib/python3.9/ipaddress.py", line 53, in ip_address
2023-02-01T14:43:52.351555245Z     raise ValueError(f'{address!r} does not appear to be an IPv4 or IPv6 address')
2023-02-01T14:43:52.351559245Z ValueError: '37.72.178.237:44837' does not appear to be an IPv4 or IPv6 address

My app is located in east-us server and looks like this problematic IP is from Russia:

37.72.178.237:44837

I wonder why I get the message "does not appear to be an IPv4 or IPv6 address"

[Martlark]

That's not an ip number. That is an ip number port. I'm not sure why it is appearing here. How are you passing the real IP to IPBAN from your proxy ?