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Able to FTP in cmd line but not windows

Posted on 2009-05-07
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Last Modified: 2012-05-06
I am trying to connect to a host using windows based ftp clients I need to find out where the problem exists  Here is what I can and connot do.
1. I can ftp to some hosts but not others using filezilla, dreamweaver and contribute
2. I can ftp in cmd mode to all hosts.  Tested on 2 PCs 1 XP one Vista
3. I can ftp to all hosts using all programs when I switch to another ISP (Leave the building and connect on other network)
4. My NAC says it is not blocking my IP address.  I believe this is verified because I can connect in DOS
5. The error message says I am unable to connect to server.  This is immediate before I have a chance to send credentials.

I need to start updating files from this site.  thanks for any help

John
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Question by:ajohnpeters
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sryckman earned 500 total points
ID: 24330772
It sounds like your firewall or the ftp sites allow active ftp but not passive ftp.   The Windows command line client uses active ftp in which it sends everything back and forth like a "pipe" on the incoming connection.   Ie: The replies from the server go back on the same socket that initiated the request.   This is considered something not favored upon by network people because there is a direct link between the two sites .    Some sites however use passive ftp and in that mode every request into the server initiates a new outbound packet from the server to the client.   The clients firewall has to support this return connection coming in.   Likewise if the ftp server is behind a firewall doing network address translation then the firewall at the ftp server site must support passive ftp as well or the source IP will be the internal network IP of the server and not the public IP address.
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by:ajohnpeters
ID: 24331080
I believe I use passive to another ftp host, and I use passive to the affected host when connecting through the other ISP.  (I may have my client set to determine best mode.)

I am not at the site where I am having problems.  I will relay the info and get the information.

Thanks, and I will keep you posted.
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by:ajohnpeters
ID: 24336837
I tried filzilla in passibe mode and it failed.  I then forced it to go to active mode, and it appears to be using the wrong IP.  I am going over ther now, and I will try the direct ip address.
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by:ajohnpeters
ID: 24343670
The problem ended out being a DNS problem.  If I connect via IP directly I could work in active mode.  If I used the domain name I could not use active mode.  the site was called do-over....com which was a test site.  The www and the do-over were on a other network, while the systems were on the same on the base network.  It may seem confusing, but it kind of works.

John
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Expert Comment

by:sryckman
ID: 24343997
Glad you found an answer, not sure why DNS would effect it in this way but if it works, it works.
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