Bug 24542 - Passive ftp doesn't use port 20
Passive ftp doesn't use port 20
Product: Red Hat Linux
Classification: Retired
Component: ftp (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Bernhard Rosenkraenzer
David Lawrence
Depends On:
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Reported: 2001-01-22 07:16 EST by Olle Hedman
Modified: 2007-04-18 12:30 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-01-22 07:16:33 EST
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Description Olle Hedman 2001-01-22 07:16:30 EST
I run into trouble when using ftp from a redhat 7.0 server (uname -r 
2.2.16-22) to another linux machine (uname -r 2.2.12-20). After login I 
try a "ls", thus using passive ftp, and find that the redhat 7.0 machine 
is using an arbitray high port instead of port 20. This will cause 
problems with firewalls. 

The behavior is as follows:
ftp> ls
227 Entering Passive Mode (IP for the "other linux machine",port)
where it should be:
ftp> ls
227 Entering Passive Mode (IP for the "redhat 7.0 server",port)
Comment 1 Bernhard Rosenkraenzer 2001-01-22 07:56:02 EST
This is not a bug, but an RFC compliant security fix.
You need to update either the ftp server or the firewall (probably the latter).

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