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Open Ports

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by galehickey2

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I have a wireless Linksys router with ZoneAlarm. Using GRC'S Shields Up Test I show no open ports-STEALTH only. However, a trojan program I have checks the registry and files for trojans but also for open ports and its shows that some of the more common ports,135 and 139 for example, are open. Could someone explain this. Thank you.

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by curacao_dejavu

grc tests the connection from the internet to your computer, and that one is protected via zone-alarm, hence the stealth.
The trojan is on your computer and uses those ports, per default a forewall allow all traffic originating from the computer to go outside. furthermore in your case it's probably registered in zone-alarm to allow to go outside.
So if you dont want it to go outside you have to block it explicitely in zone-alarm.

Leopold

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