[Python] Python: Sockets not working over LAN

I recently came back from vacation, and my basic python 2 socket server is now unable to communicate with clients over LAN. The server is on a mac, and the client is my raspberry pi or my windows 7 machine. I have simplified the server and client code here to give an example:

Server

import socket
from thread import *

HOST = socket.gethostname()

print HOST

PORT = input ("Enter the PORT number (1 - 10,000)")



s = socket.socket(socket.AF_INET, socket.SOCK_STREAM )
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print "Socket Created"


s.bind((HOST, PORT))

print "Socket Bind Complete"

s.listen(10)
print "Socket now listening"


#Sending message to connected client
#This only takes strings (words


while True:
#Wait to accept a connection - blocking call
connection, addr = s.accept()
print "Connection Established!"

connection.send("Welcome to the server. Type something and hit enter\n")

#loop so that function does not terminate and the thread does not end
while True:

#Receiving from client
data = connection.recv(1024)
if not data:
break
connection.sendall(data)
print data
connection.close()
s.close()


Client

import socket #for sockets
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "Socket Created"

#Get host and port info to connect
host = raw_input("HOST >>> ")
port = 2468
s.connect((host, port))


while True:
#Send some data to the remote server
message = raw_input(">>> ")

#set the whole string
s.sendall(message)


reply = s.recv(1024)
print reply


Question

What is going on here? I am getting the local IP, but the scripts are still not able to communicate. Could it be an issue with the OS's?


MORE INFO

1. 
   Pinging
   
   a. I was able to ping the PI from my Mac terminal:
   
   PING raspberrypi (67.63.55.3): 56 data bytes
   64 bytes from 67.63.55.3: icmp_seq=0 ttl=240 time=17.434 ms
   64 bytes from 67.63.55.3: icmp_seq=1 ttl=240 time=18.180 ms
   64 bytes from 67.63.55.3: icmp_seq=2 ttl=240 time=22.046 ms
   64 bytes from 67.63.55.3: icmp_seq=3 ttl=240 time=25.124 ms
   64 bytes from 67.63.55.3: icmp_seq=4 ttl=240 time=31.773 ms
   
   
   b. My PI was not able to find the Mac as a host. I will see what I can do to remedy this.
   
   c. My PC was able to PING my mac. My Mac was able to ping my PC
   
   
2. 
   Firewall
   

My Mac's Firewall is off. I will check on the [Raspberry Pi Stackexchange Site] to see if the PI has a firewall.

I will add more info once I test my windows machine

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