RE: FTP PORT COMMANDS FAILED

Hi Linzi

I may be about to 'shoot myself squarely in the foot' - but this sounds to
be an exact replica of a problem I faced at a client site recently.....I
eventually tracked the problem down to the RSS setting on the SBS boxes'
external nic. As soon as I disabled 'receive side scaling' the problem
evaporated - as I say I may be talking out of turn as I was sure that there
had been MS updates to alleviate the issue, but I thought I should mention it.

Mark

"Long Blonde Sally" wrote:

Hi Guys

We have an issue with FTP which is proving very difficult to solve, so first
some background.

SBS 2003 Standard in a multihomed configuration.
Nic to router on private IP passing to Cisco router (double NAT)
Incoming packets passed to server using DMZ

Everything works well,l except when trying to use any FTP client to almost
any FTP server in Passive or non passive mode. FTP client able to login, but
then session dies.

What we have tried :

1. We connected a laptop to the router directly and tried to FTP out. This
works fine
2. Opened incoming ports 20-21-22 on windows firewall and forwarded to
client running FTP
3. Started ALG service and used commands as below

netsh interface ip delete arpcache
Netsh routing ip nat add ftp

4. Disabled firewall on extrenal interface on RRAS

This has all been to no avail.

I have found many references to the problem on the web, but no real
solutions. I am confident that this is a RRAS NAT issue, but I cannot find
the solution.

Any help would be gratefully received


Linzi


.

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