What (Windows, Linux, macOS) or software are you using? Are you facing a specific error message ?
To understand "proxy 12345," you first need to understand the relationship between an IP address and a port:
Did you mean one of the following?
He typed a command to intercept the traffic: mitmproxy --mode upstream:http://hidden-node:12345
Identifies the "door" (the specific service) you use to enter that house.
import socket import threading def handle_client(client_socket): # Basic proxy logic to forward requests request = client_socket.recv(1024) print(f"Received request: request.decode('utf-8')[:50]...") # Normally, you would parse the request, connect to the destination server, # send the request, and send back the response. # ... (skipping complex parsing for brevity) ... client_socket.close() def run_proxy(port=12345): server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind(('127.0.0.1', port)) server.listen(5) print(f"[*] Listening on 127.0.0.1:port") while True: client, addr = server.accept() print(f"[*] Accepted connection from addr[0]:addr[1]") client_handler = threading.Thread(target=handle_client, args=(client,)) client_handler.start() if __name__ == "__main__": run_proxy() Use code with caution. Configuring Applications to Use Proxy 12345
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If you have a legitimate proxy service that uses this port, here is how you typically set it up: On Windows/macOS: Go to . Select Proxy . Enter the server address provided by your vendor. In the Port field, enter 12345 . Save and apply. In Python (Requests Library):
Custom proxies can be optimized for specific tasks, such as high-volume web scraping or managing persistent connections.