windows - How can my java app detect if its being blocked by firewall -

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i have created application desktop using java works server , accepts incoming connections using serversocket . software works on lan , needs allowed firewall. how can check within app if being blocked pc's firewall ?

you can try connect reliable site eg stackoverflow.com 

   try {         new socket("stackoverflow.com", 80);     } catch (ioexception e) {         // wrong, not firewall problem         ...      }      // no firewall

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