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Firewall/FTP 'Connection reset by remote host'

Hi am fairly new at this so please bare with me. Currently we are running IIS 5.0 FTP server in our DMZ behind a Nokia Checkpoint firewall. Every once and a while, we have customers complain that they are getting the error 'Connection reset by remote host'. I have run over the server with a fine tooth comb and haven't come up with anything. I have even gone as far as moving the server out of the DMZ into our regular network and having them test it there. When I do this, no error is recieved. Next, I tried putting it behind a PIX firewall that we have in another DMZ and we were able to reproduce the problem. I found an article on Microsoft's Knowledge Base the describes the exact problem, but no real way to fix it. http://support.microsoft.com/default.aspx?scid=kb;en-us;283679. At this point, I am at a loss of what to do. Our WAN administrator says that the firewalls are setting up to allow ports 20 and 21, however, whenever the server is behind a firewall we get the conneciton error. Can anybody offer any suggestions?
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kria
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kria
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sudev_shettyCommented:
u must be knowing about active and passive ftp
if not learn about that and u can solve the problem by your own
let me know if u need any help
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kriaAuthor Commented:
You are correct. I do know about the difference about passive and active FTP. The main problem I seem to be having is with our firewalls. I have run several tests and nearly proved beyond a shadow of a doubt that the problem is not the server. However, I don't control the firewalls so I was hoping someone could give me something like an article or reference material that I could take to our WAN team.

Thanks for your help!
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sudev_shettyCommented:
ok if u dont have control on the firewall then enable passive mode in the ftp server and the client it will start working
which ftp server do u have ??
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kriaAuthor Commented:
We currently use IIS 5.0 for our FTP server, however, this problem has been replicated using IPSwitch's WS_FTP server.
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sudev_shettyCommented:
there is no optinons for active or pasive ftp in iis but u can do it in IPSwitch and WS_FTP server
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kriaAuthor Commented:
Do you think it would be better to switch to WS_FTP server then? I have no problems with this.
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sudev_shettyCommented:
insted of ws_ftp switch to ipswitch imail server its a very good server
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