refused connection

[mcgrim]

I am trying to take pics with the webcam and send them to the client via socket.
I am not sure why, the server, which I always start first, stops almost immediately and the following error shows:

Error:
Traceback (most recent call last):
  File "C:/Users/PycharmProjects/client-server/server.py", line 14, in <module>
    s.connect((host, port))
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

here are both codes
SERVER

import cv2
import time
import socket
from PIL import Image
import pickle
import struct


host = socket.gethostname()
port = 8485


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.listen(5)
conn, address = s.accept()

print("server started...")

capture = cv2.VideoCapture(0)
capture.set(3, 640)
capture.set(4, 480)
img_counter = 0
#frame_set = []
start_time = time.time()

while True:
    ret, frame = capture.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    cv2.imshow('frame', gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    if time.time() - start_time >= 1: # how often (secs) are pics taken
        filename = "opencv_frame_{}.png".format(img_counter)
        #cv2.imwrite(filename, frame)
        data = pickle.dumps(frame, 0)
        size = len(data)
        print("{} written!".format(img_counter))
        start_time = time.time()
        s.sendall(struct.pack(">L", size) + data)
        img_counter += 1

capture.release()

CLIENT

import socket
import cv2
import pickle
import struct


host =  socket.gethostname()
port = 8485

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))

conn,addr=s.accept()

data = b""
payload_size = struct.calcsize(">L")
print("payload_size: {}".format(payload_size))
while True:
    while len(data) < payload_size:
        print("Recv: {}".format(len(data)))
        data += conn.recv(4096)

    print("Done Recv: {}".format(len(data)))
    packed_msg_size = data[:payload_size]
    data = data[payload_size:]
    msg_size = struct.unpack(">L", packed_msg_size)[0]
    print("msg_size: {}".format(msg_size))
    while len(data) < msg_size:
        data += conn.recv(4096)
    frame_data = data[:msg_size]
    data = data[msg_size:]

    frame=pickle.loads(frame_data, fix_imports=True, encoding="bytes")
    frame = cv2.imdecode(frame, cv2.IMREAD_COLOR)
    cv2.imshow('ImageWindow',frame)
    cv2.waitKey(1)