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FTP problems going through Cisco 1841

I have been having some intermittant problems using ftp on various computers. We have a cisco router. It will connect t the site, but then the problems start. In active mode, it gives the error 425 can't open data connection when doing MLSD. When using pasive mode, it gives a 421, can't create socket and then a timeout. Not sure if this is a router issue, but if I use an air card with the same computer, it works fine. It also works fine on another network. The computer is running windows xp and we are using filezilla. We also tried the comand line and it hangs when doing a directory listing. Any soggestions on what is wrong or how to troubleshoot this. We finally have a duplicatable situation. I enabled logging on the router and nothing is blocked.
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premiere1
Asked:
premiere1
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1 Solution
 
Istvan KalmarHead of IT Security Division Commented:
Hi,

what is the mtu size on coppper port and air?

please use drtcp
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premiere1Author Commented:
It is 1500. Not sure on the air card, that computer is not here right now. This problem is al across our network. Is there a way to debug and see what is happening?
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premiere1Author Commented:
Another note, it is not all ftp sites, only certain ones in certain situations.

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Istvan KalmarHead of IT Security Division Commented:
you able to chack with wireshark
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thaibnCommented:
Check your windows xp firewall. Make sure you allow FTP and FTP-data ports through.
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premiere1Author Commented:
I have not used wireshark, please advise on what I should do.

Firewall is turned off and the ftp works through other connections and does not work on other machines through this connection.
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premiere1Author Commented:
Problem was not solved, but closing question
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