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TMG dropping FTP data channel on high ports

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TMG dropping FTP data channel on high ports - 28.Jan.2011 8:34:58 AM   
carolchi

 

Posts: 17
Joined: 6.Jun.2004
From: Switzerland
Status: offline
I have a TMG 2010 running on Windows 2008 R2 (hosted on Hyper-V).
It is a back firewall.
It also has MS FTP server 7.5 on it, with isolates local users.

When the client connects I see a port 21 control channel open, and the FTP server responds on a high port (changes each time). The FTP client tries to open the data channel on the high port, which is dropped by the TMG server.

Any ideas:
How can I force MS FTP 7.5 to use port 20 for the data channel? (my preference)
How can I open TMG to these randon high ports for a specific client IP address.
Post #: 1
RE: TMG dropping FTP data channel on high ports - 28.Jan.2011 9:16:46 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

not a good idea run any other service on your firewall. Just because you can, doesn´t mean you should.

About allowing FTP access, on TMG you just need to allow built-in FTP protocol (make sure FTP Application Filter is bound to it) it will open dynamic ports as needed.

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
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(in reply to carolchi)
Post #: 2

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