This is python script can be used to login to iitk fortigate ip configured server.

IITK Fortigate script to login

#!/usr/bin/env python

import requests
import time
import re
import sys
import getpass
from bs4 import BeautifulSoup

def liveSession( html ):
    a = 0
    while True:
        a = a + 1
        for i in range(50):
            time.sleep(1)
            sys.stdout.write("\r%d times refreshed! Next Refresh in %2d seconds" % (a, 50-i))
            sys.stdout.flush()
        soup = BeautifulSoup(html, "html.parser")
        script = soup.script.string
        arrayString = re.findall('"([^"]*)"', script)
        url = arrayString[0]
        html = requests.get(url).text
    return



def login():
    soup = BeautifulSoup(requests.get('http://google.com').text , "html.parser")

    Magic = soup.find("input", {'name': "magic"}).attrs['value']
    Tredir = soup.find("input", {'name': "4Tredir"}).attrs['value']

    UserName = raw_input('IITK user name:')
    Password = getpass.getpass('Password:')

    payload = {'4Tredir': Tredir, 'magic': Magic, 'username': UserName, 'password': Password }

    f = requests.post('https://gateway.iitk.ac.in:1003', data = payload);

    soup = BeautifulSoup(f.text , "html.parser")
    if soup.h2.string is not None:
        str = soup.h2.string
        print str
        substr = 'again'
        if substr in str:
            return True
    print "Fortinet Loggined!"
    liveSession(f.text)
    return False

requestLogout = requests.get('https://gateway.iitk.ac.in:1003/logout?0501030a00253727')
time.sleep(1)

if re.match('(200)|(303)', str(requestLogout.status_code)) is not None :

    while login():
        print "Try Again!"

else:
    print "Internet connection Problem!"

You may have to install beautiful soup python library to run this. You can install it by

pip install beautifulsoup4