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FTP hang at LIST or MLSD command for some sites

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All Forums >> [ISA Server 2004 Firewall] >> SecureNAT Client >> FTP hang at LIST or MLSD command for some sites Page: [1]
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FTP hang at LIST or MLSD command for some sites - 10.Mar.2009 3:09:50 AM   
Money Penney

 

Posts: 132
Joined: 18.Sep.2002
From: Melbourne
Status: offline
ISA 2004 SP3, dual NIC, behind NAT dual WAN router.

When I try and FTP to remote FTP servers from Secure NAT clients (Specifically Mac workstations) many sites hang at the LIST or MLSD command, never showing a directory listing.

Same sites work fine from Firewall client PCs, and without ISA "in the way"

Connections are PASV of course (not sure how to get Active working for these clients).

Strange thing is that some sites will work, such as ftp.symantec.com without any problems, but many will just hang at the LIST command.

I need to test without the NAT dual WAN router in place but I don't see that being the problem (if I plug in to the router direct I have no problems).

Looking at the logs, it is the second transfer of data with the different port (FTP data channel?) that is coming back with 0 bytes in the sites that don't work.  Whereas they come back with bytes for sites that work.  Something seems to be tripping up here but just for some sites???  Anyone got any suggesetions, have searched but have not found this specific problem/solution (or missed it).
Post #: 1
RE: FTP hang at LIST or MLSD command for some sites - 10.Mar.2009 3:14:16 AM   
Money Penney

 

Posts: 132
Joined: 18.Sep.2002
From: Melbourne
Status: offline
OOPS!

Looks like there may be a problem with the router after all, just tested it myself first hand and I had problems... someone will get their butt kicked for telling me otherwise.

Will post back if ends up being ISA issue.

(in reply to Money Penney)
Post #: 2

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