External FTP access on custom port

I am trying to set up FTP access for external users.  Naturally, I don't want to open Port 21 to the outside world so I began by creating a firewall rule to forward a custom port 2100 to the server, translating it to 21.  When that failed I changed the listening port in IIS to 2100.  Internally I can access the FTP no problem with:
ftp://server:2100
When I try to access externally however I get a timeout.
If I change the listening port on the server (and the firewall rule) to 21 it works.
When I have everything set to 2100 I'm getting to the server- but this is what I get in the FTP log:

15:14:34 173.15.202.187 [17]USER receptionist 331 0
15:14:34 173.15.202.187 [17]PASS - 230 0
15:14:34 173.15.202.187 [17]CWD / 250 0

So- what else do I need to change to allow the custom port?
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STS-TechAsked:
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Jaroslav MrazCTOCommented:
Firewall in server and try pasiv mode in client
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STS-TechAuthor Commented:
Firewall is disabled on server- but I added an exclusion for port 2100 just to be on the safe side.  Passive mode was already enabled in IE, but tried turning it off- same result.  Also tried opening in Windows Explorer- same thing.
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STS-TechAuthor Commented:
I'm using the following to connect:
ftp://'ipaddress':2100/

Should I be doing something different?
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Jaroslav MrazCTOCommented:
Hmm sometimes is problem IE try fiezilla its free client IP without '
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STS-TechAuthor Commented:
Results from Filezilla:

Response:      230 User receptionist logged in.
Command:      SYST
Response:      215 Windows_NT
Command:      FEAT
Response:      211-Extended features supported:
Response:       SIZE
Response:       MDTM
Response:      211 END
Status:      Server does not support non-ASCII characters.
Status:      Connected
Status:      Retrieving directory listing...
Command:      PWD
Response:      257 "/" is current directory.
Command:      TYPE I
Response:      200 Type set to I.
Command:      PASV
Response:      227 Entering Passive Mode (192,168,10,2,199,48).
Status:      Server sent passive reply with unroutable address. Using server address instead.
Command:      LIST
Response:      425 Can't open data connection.
Error:      Failed to retrieve directory listing
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STS-TechAuthor Commented:
"Fixed" it.  Installed Filezilla server, this allowed me to set a range of ports to be used by passive mode.  Added those ports to the Custom FTP service in the firewall and I'm in.  Not really a true fix as I'd rather use IIS, but the results are the same for the end users.

Thanks for pointing me in the right direction with FZ!
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