Ben, j'ignore comment on peut vérifier si un port est ouvert...
Le premier lien que j'ai trouvé sur Google est un test qui renvoie ça :
GRC Port Authority Report created on UTC: 2011-09-06 at 07:47:13
Results from scan of ports: 0-1055
0 Ports Open
0 Ports Closed
1056 Ports Stealth
---------------------
1056 Ports Tested
ALL PORTS tested were found to be: STEALTH.
TruStealth: PASSED - ALL tested ports were STEALTH,
- NO unsolicited packets were received,
- NO Ping reply (ICMP Echo) was received.