| OS X UDP Port 137, 138, 139 Kill To Disable Ports 137, 138, and 139 in Mac OS X, turn off passive FTP (system prefs/network/proxies/the box labeled Use Passive FTP Mode... You would have personally turned it on when you enabled the firewall) if you are behind OS X's built in firewall. You will not be able to download from FTP sites, but you will have 3 less UDP ports open. This one is for the exceptionally paranoid. |
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 rv
@verizon.net | I have passive ftp turned on in the Network preferences and ports 137 to 139 are not open. If ftp is checked in sharing prefs then ports 20-21 and ports above 1023 can be open.
If passive ftp is checked then you should be able to initiate connections and receive ftp downloads but no one externally should be able to initiate a connection to your machine. I have not had trouble downloading and scans don't show open ports to the outside with passive checked.
rv |
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| reply to The_Merovingian
How would you disable these ports on a machine using Windows XP?
Thanks |
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| reply to The_Merovingian
said by The_Merovingian:
To Disable Ports 137, 138, and 139 in Mac OS X, turn off passive FTP (system prefs/network/proxies/the box labeled Use Passive FTP Mode... You would have personally turned it on when you enabled the firewall) if you are behind OS X's built in firewall. You will not be able to download from FTP sites, but you will have 3 less UDP ports open. This one is for the exceptionally paranoid.
for reference, i just disabled passive ftp, ran tests to make sure my UDP ports all showed filtered (they do), and then tried to connect to a couple of ftp sites and succeeded, no problems. so disabling passive ftp does not necessarily render one unable to connect to all ftp sites. some of them, perhaps...but i haven't encountered any like that yet. |
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