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FTP Through a router?!?
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hummer010
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Post Posted: Fri Jun 13, 2003 7:38 am   Post subject: FTP Through a router?!? Reply with quote Back to top  
I have an SMC 7004AWBR wireless router, and I want to run an ftp server through it.

I can connect to the ftp server, the username and password is verified, and then it always times out on the list command. The error is :425 Unable to open the data connection. I am using CERBERUS as my ftp server running on Win2K Pro.

I have port 21 forwarded to the ftp server. I have tried enabling DMZ for the ftp server in the router setup with no joy.

Is there some other port I need to forward?

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Last edited by hummer010 on Fri Jun 13, 2003 8:10 am; edited 1 time in total
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wrathiron
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Post Posted: Fri Jun 13, 2003 7:46 am   Post subject: Reply with quote Back to top  
21

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hummer010
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Post Posted: Fri Jun 13, 2003 8:09 am   Post subject: Reply with quote Back to top  
Whoops. Guess I should have mentioned that I already have port 21 forwarded to the ftp server.

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fear_nothing
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Post Posted: Fri Jun 13, 2003 9:35 am   Post subject: ftp ports Reply with quote Back to top  
Straight from RFC 793

ftp-data 20/tcp File Transfer [Default Data]
ftp-data 20/udp File Transfer [Default Data]
ftp 21/tcp File Transfer [Control]
ftp 21/udp File Transfer [Control]



You prob won't need the UDP ports, just 20 and 21

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Slashdot poster: I don't use commercial applications. I don't use programs for my security tests. I do the tests myself everyday.

Slashdot reply: You don't use programs? What, you put the cat-5 in your mouth and try to *taste* the intruders?

An infinite number of monkeys pounding away on keyboards will eventually produce a report showing that Windows is more secure and has a lower TCO, than linux.
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hummer010
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Post Posted: Fri Jun 13, 2003 10:47 am   Post subject: Reply with quote Back to top  
I have both the TCP and UDP ports 20 and 21 forwarding to the ftp server. I still get the same error: 425 unable to open the data connection.

Do I need to be dealing with PASV transfers?

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fear_nothing
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Post Posted: Fri Jun 13, 2003 11:07 am   Post subject: Reply with quote Back to top  
It depends on your FTP server...

http://www.cerberusftp.com/cerberus-releasenotes.htm#KnownIssues

I'd do some checking to see what mode of FTP it runs under... active or passive.

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-Fear

Remember when it comes to Information Security only the paranoid will survive….






Slashdot poster: I don't use commercial applications. I don't use programs for my security tests. I do the tests myself everyday.

Slashdot reply: You don't use programs? What, you put the cat-5 in your mouth and try to *taste* the intruders?

An infinite number of monkeys pounding away on keyboards will eventually produce a report showing that Windows is more secure and has a lower TCO, than linux.
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MrE
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Post Posted: Mon Jun 23, 2003 6:01 pm   Post subject: Reply with quote Back to top  
you might need to forward more than just port 21

with my Linksys Router, running GuilFTPd , I have to forward port 21 and the entire range of ports 50001 - 50100
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Zorched
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Post Posted: Fri Jun 27, 2003 6:02 pm   Post subject: If the router is doing NAT Reply with quote Back to top  
Then certain ftp clients will need PASV ftp enabled on their end in order to work properly.
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fear_nothing
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Post Posted: Sun Jun 29, 2003 5:16 pm   Post subject: Reply with quote Back to top  
any luck on this?

_________________
-Fear

Remember when it comes to Information Security only the paranoid will survive….






Slashdot poster: I don't use commercial applications. I don't use programs for my security tests. I do the tests myself everyday.

Slashdot reply: You don't use programs? What, you put the cat-5 in your mouth and try to *taste* the intruders?

An infinite number of monkeys pounding away on keyboards will eventually produce a report showing that Windows is more secure and has a lower TCO, than linux.
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