security - Router blocking response from external networks -

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I am currently working on a company network, and I have come across a problem where my script is not connected to external Can be networked I'm just thinking that any network knows the general behavior in security, which can be the reason for it?

Ex I can go to www.example.com on Firefox, but my dragon script will get a timeout error if it tries to connect. 

  import urllib.request f = urllib.request.urlopen ( 
 this script works perfectly well on other networks or if I change the URL to the local network. 'Http: //www.python.org/') print (f.read (300))

Answer : Browser uses a proxy of the network

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