Using Python to check if remote port is open and accessible.

is_port_open.py

import time
import socket

ip = "mylicenseserver.mydomain.com"
port = 27000

responses = []

for i in range(10):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(1)
        s.connect((ip, port))
        responses.append("{} is UP".format(ip))
    except:
        time.sleep(1)
    finally:
        try:
            s.shutdown(socket.SHUT_RDWR)
            s.close()
        except OSError:
            responses.append("{} is DOWN".format(ip))

results = "\n".join(responses)

if "DOWN" in results:
    print("Server is down.")
else:
    print("Server is up!")

is_port_open_README.md

Using Python to check if remote port is open and accessible.

Taken from http://snipplr.com/view/19639/test-if-an-ipport-is-open/