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Benjamin

How to detect a client is behind firewall?

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Trial and error.. try to connect to them, and if you fail they''re most probably behind a firewall of some kind.
Of course you could also let the users specify whether they''re behind one, but users are generally the most unreliable part of the system

cu,
Prefect

---
Sanity is the trademark of a weak mind.

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If the ip address according to the client is different than the ip address acording to your connection, then they''re behind a NAT (which means a firewall of some kind is there). That could prevent someone from the internet initiating a connection to thier computer.

Magmai Kai Holmlor
- The disgruntled & disillusioned

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