python -m http.server fails with OSError: Socket is not connected

[smallmoonzz]

# Bug report

### Bug description:

(base) ➜  ~ python -m http.server 8000
Serving HTTP on :: port 8080 (http://[::]:8080/) ...
----------------------------------------
Exception occurred during processing of request from None
Traceback (most recent call last):
  File "/opt/anaconda3/lib/python3.12/socketserver.py", line 692, in process_request_thread
    self.finish_request(request, client_address)
  File "/opt/anaconda3/lib/python3.12/http/server.py", line 1311, in finish_request
    self.RequestHandlerClass(request, client_address, self,
  File "/opt/anaconda3/lib/python3.12/http/server.py", line 672, in __init__
    super().__init__(*args, **kwargs)
  File "/opt/anaconda3/lib/python3.12/socketserver.py", line 761, in __init__
    self.handle()
  File "/opt/anaconda3/lib/python3.12/http/server.py", line 436, in handle
    self.handle_one_request()
  File "/opt/anaconda3/lib/python3.12/http/server.py", line 404, in handle_one_request
    self.raw_requestline = self.rfile.readline(65537)
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/anaconda3/lib/python3.12/socket.py", line 720, in readinto
    return self._sock.recv_into(b)
           ^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 57] Socket is not connected
----------------------------------------

os: Darwin moonzzMacBook-Pro.local 24.2.0 Darwin Kernel Version 24.2.0: Fri Dec 6 18:41:43 PST 2024; root:xnu-11215.61.5~2/RELEASE_X86_64 x86_64
my ip : 192.168.148.212
my vmware ubuntn ip : 192.168.73.182

I user python -m http.server run http server in my mac, run tomcat on port 8080

in mac: use curl 192.168.148.212:8000，got the error， curl localhost:8000 got ok
in ubuntn use curl 192.168.148.212:8000，got the error。

i use wireshark catch it 1.pcap, you can get it from cat 1.txt | base64 -d > 1.pcap

1.txt

(base) ➜  Downloads sudo tcpdump 'tcp port 8000 || tcp port 8080'
tcpdump: data link type PKTAP
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on pktap, link-type PKTAP (Apple DLT_PKTAP), snapshot length 524288 bytes
12:12:05.925789 IP 192.168.73.182.60256 > 192.168.148.212.irdmi: Flags [S], seq 1949593479, win 64240, options [mss 1460,sackOK,TS val 423466448 ecr 0,nop,wscale 7], length 0
12:12:05.926113 IP 192.168.148.212.irdmi > 192.168.73.182.60256: Flags [S.], seq 1076460035, ack 1949593480, win 64240, options [mss 1460], length 0
12:12:05.926317 IP 192.168.73.182.60256 > 192.168.148.212.irdmi: Flags [.], ack 1, win 64240, length 0
12:12:05.926470 IP 192.168.73.182.60256 > 192.168.148.212.irdmi: Flags [P.], seq 1:85, ack 1, win 64240, length 84
12:12:05.926574 IP 192.168.148.212.irdmi > 192.168.73.182.60256: Flags [.], ack 85, win 64240, length 0
12:12:05.933618 IP 192.168.148.212.irdmi > 192.168.73.182.60256: Flags [FP.], seq 1, ack 85, win 64240, length 0
12:12:05.934082 IP 192.168.73.182.60256 > 192.168.148.212.irdmi: Flags [F.], seq 85, ack 2, win 64239, length 0
12:12:05.934208 IP 192.168.148.212.irdmi > 192.168.73.182.60256: Flags [.], ack 86, win 64239, length 0

other versions of my python also hit this， did it is related to python or macos?

CPython versions tested on:

3.12

Operating systems tested on:

macOS

[smallmoonzz]

sorry，my mistake.

It is the tcp fin packet send by the firewall，the problem disapper after close the firewall.

# see state of firewall
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate

# list allow apps
sudo /usr/libexec/ApplicationFirewall/socketfilterfw --listapps

[picnixz]

@smallmoonzz Can this be closed then if it's a firewall issue on your side?

[jason19970210]

Hi folks,

I am wondering to know about what if I cannot just disable the firewall ?
I have already set process python3 as Allow incoming connections in the firewall option on my macOS.

Thanks

[picnixz]

I'm not sure we can do anything on our side because if the OS is refusing to let us use the port, then I doubt we can force it to allow it.

[picnixz]

I'm going to close this as Python can't really do anything if firewall rules are in place =/ I would advise asking on https://discuss.python.org/c/help/7 though.