Bug 24542 - Passive ftp doesn't use port 20
Summary: Passive ftp doesn't use port 20
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: ftp
Version: 7.0
Hardware: i386
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Bernhard Rosenkraenzer
QA Contact: David Lawrence
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2001-01-22 12:16 UTC by Olle Hedman
Modified: 2007-04-18 16:30 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2001-01-22 12:16:33 UTC
Embargoed:

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Description Olle Hedman 2001-01-22 12:16:30 UTC 
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 12:56:02 UTC 
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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