TCP Socket not connecting [WinError 10060] - Python

I'm making a chat app using sockets in python, but when I try to connect from a different computer then it says:

C:\Users\James\OneDrive\Documents\Python\Projects\Gui Chat\client.pyw [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

This is the server code for the socket:

host = socket.gethostbyname(hostname)
port = 55555
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((host, port))
print(f"IP: {server.getsockname()[0]}\nPORT: {server.getsockname()[1]}")
server.listen()

I also have a while True loop accepting all requests:

while True:
   client, address = server.accept()
   print(f"Connected with {str(address)}")

On the client end this is the socket code:

IP = simpledialog.askstring("IP", "Enter IP address", parent=root)  # "192.168.1.252"  # input("Enter IP: ")
nickname = simpledialog.askstring("Nickname", "Choose a nickname", parent=root)

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
    client.connect((IP, 55555))
except Exception as e:
    print(e)

The programme asks for the IP address each time, and when I put in the correct IP for the server computer, it comes up with the error above. It works if I try to connect from the same computer, and they are both on the same network. It was working recently, and now it has just stopped working.

UPDATE: I have set the server ip to 0.0.0.0, I have set up a port forwarding rule, I have checked the firewall and allowed incoming and outgoing connections, and I have run nmap with these results: