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FTP server behind NAT
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Slinky
Junior Member
Registered: Aug 2000
Location: 35° 24' N 97° 36' W
Country: US of A
State:
Certifications: A+, N+, MCSA
Working on: MCSE
Total Posts: 2009
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 FTP server behind NAT
Does anybody have an FTP server using IIS 5.0 behind NAT and have it work successfully? I opened up port 21 and port 20 in RRAS and I can't get the data transfers to work. I can connect just fine. I understand the difference between active mode and passive mode for the clien, and I have tried both but I get the same result of not working. Anybody have any ideas?
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 06-28-02 08:05 PM
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KScheler
Senior Member
Registered: Oct 2001
Location: Abbott,TX
Country: United States
State:
Certifications: Network+, A+, MCSE NT4, MCSE 2000, MCSA 2000
Working on: MCSA/MCSE 2003
Total Posts: 734
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06-28-02 08:35 PM
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Slinky
Junior Member
Registered: Aug 2000
Location: 35° 24' N 97° 36' W
Country: US of A
State:
Certifications: A+, N+, MCSA
Working on: MCSE
Total Posts: 2009
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If we're talking about the same thing I right clicked on the public interface, went to properties, and then the special ports tab and opened up port 20 and 21. Passive mode is supposed to get around this by allowing the server to specify the data port but it still doesn't work. 
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06-28-02 09:23 PM
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KScheler
Senior Member
Registered: Oct 2001
Location: Abbott,TX
Country: United States
State:
Certifications: Network+, A+, MCSE NT4, MCSE 2000, MCSA 2000
Working on: MCSA/MCSE 2003
Total Posts: 734
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Yes, that's what I'm talking about. Are you accessing it with a FTP client or web browser? We did not do anything extra to ours and can access it fine with a browser. I haven't tried with a ftp client though.
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06-29-02 03:27 PM
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Slinky
Junior Member
Registered: Aug 2000
Location: 35° 24' N 97° 36' W
Country: US of A
State:
Certifications: A+, N+, MCSA
Working on: MCSE
Total Posts: 2009
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06-29-02 03:49 PM
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Deja-vue
Challenge Everything
M
Registered: Jul 2001
Location: Long Beach
Country: United States
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Certifications: MCSA 2000
Working on: MCSE 2000,MCSE 2003
Total Posts: 3243
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Slinky
On the Client Side, in CuteFTP for example, go to advanced properties,(or edit properties),uncheck *Firewall mode* and uncheck *PASV Mode*.
I had clients on my FTP with the same problem, this fixed it.
By the Way, i use Bulletproof FTP Server, a really cool 3rd Party FTP Server.
www.bpftpserver.com
please let us know, how you fixed it.
__________________
My Home Theater
My DVD Collection
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06-29-02 07:15 PM
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necrophantasm
Senior Member
M
Registered: Mar 2001
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Country: United States
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Certifications: A+, N+, I-N+, Lx+, Sec+, Ser+, CCNP,CCDP, MCDST, MCSA, MCSE, MCTS, MCITP, CIW-A, MCDBA, MCT
Working on: MCITP Vista; CCSP
Total Posts: 372
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I have gotten it to work, but there is a condition. FTP clients in passive mode can't connect to servers behind NAT. Passive clients use dynamically allocated ports to establish the initial connection so just using port forwarding on 20 and 21 won't work. If you have clients using CuteFTP, if they go into the connection options and uncheck passive mode, they probably won't have a problem. I haven't tried this with 2K RRAS NAT, but I have had this problem at work with Cisco-implemented NAT. The only way i was able to resolve it for clients that HAD to use passive mode was to allow them to connect using all ports (full access to my network... Grrr). Hope this helps!
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07-02-02 02:57 PM
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