FTP SITE access using port#s on Win2k server

Well i setup 2 ftp sites on my win2k server

first one uses default port 21
the second one uses port 8081

now over the internet i have no problem accessing ftp site at port#21
just simply i type : ftp://<domain_name/ and see my folders

if i want to access second ftp site i simply type:
ftp://<domain_name>:8081/ but it doesnt work says pagenotfound
i also tried
ftp://<wan_ip_address>:8081/ same thing

if i am on local network where the server is everything is ok
i type:
ftp://localhost/   and ftp://localhost:8081
or
ftp://<local_ip>/ and ftp://<local_ip>:8081
all work fine!

now i have a sonicwall firewall and i setup a service to allow TCP access to my server at port 8081. when i use port scan tool it says that port 8081 is open.
so i am really confused at whats is wrong here

thanks



rejusAsked:
Who is Participating?
 
bbaoConnect With a Mentor IT ConsultantCommented:
FYI:
Active FTP vs. Passive FTP, a Definitive Explanation
http://slacksite.com/other/ftp.html
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bbaoIT ConsultantCommented:
if you can test the FTP server at the WAN side without (or behind) the firewall, it would be helpful for us to determine where is the problem. :)
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rejusAuthor Commented:
i cant do that. is there another way?
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bbaoIT ConsultantCommented:
have you tried passive mode ftp?
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rejusAuthor Commented:
what is passive mode ftp?
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