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proxy & lan problems

i am developing a Client Server chat program and would like to know how i can get around the problems of LAN's and proxy servers, What i mean is how can i send and recieve data from a freind that is on a network and behind a proxy to a person over the internet?

Code examples would be excellent!

thank you for any help

marc
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markburns90
Asked:
markburns90
1 Solution
 
Wim ten BrinkSelf-employed developerCommented:
Interesting. I thought you weren't supposed to get around firewalls and proxies. You will have to configure them to allow your application to access 'the other side'...
If your application could get around the proxy or firewall, then the firewall or proxy would be worthless as protection...

Better ask how to open the firewall or proxy for your application to work correctly.
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AvonWyssCommented:
An option would be to have your friend connect to one of your servers using the HTTP protocol (with headers which disable caching and enable keep-alive of the connection). This protocol can be used to tunnel about any data and is seldom really restricted on proxies or firewalls.

Note, however, that without a configuration change on the firewall/proxy, you cannot connect to his computer - but once the connection is established, data can be transferred in both directions.
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RayNorrishCommented:
If you use the indy components for your project, you can build proxy support straight in. Apart from that, proxies /firewalls should not be your project's concern..
AvonWyss answer is a good alternative, but your application should still subscribe to the rules that would let a user/adminstrator control it's usage.
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CleanupPingCommented:
markburns90:
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