ISA 2004, FTP and IGMP

Hi,

I want to publish an FTP server using IIs 6.0 under Microsoft Small Business Premium 2003. Ive used the Create New Server Publishing rule to allow inbound access and have created a separate rule in ISA to allow outbound access. Ive created and published FTP site in IIS.

If I try and connect using Windows Explorer from a client outside the network, the site looks as if it will open then I get the error  Windows can't access this folder the name maybe incorrect or you don't have permission to access the folder.  Access from within the firewall works fine.

Looking at the ISA log, the only culprit I can see is Unidentified IP Traffic (TCP;21). ISA denies this entry a connection.

Does anyone have any idea what is going wrong? This is driving me bonkers.

Thanks

Karl
kwinswAsked:
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EricTVikingConnect With a Mentor Commented:
Presumably you're using some sort of modem/router? Do you have port 21 inbound open on the router?
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EricTVikingCommented:
On your publishing rule are you allowing incoming TCP on port 21?
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kwinswAuthor Commented:
Yup, my publishing rule allows ftp traffic on port 21 from anywhere to the IP address of my server. I also have an outbound access rule that allows outbound access over port 21.
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EricTVikingCommented:
Can you try accessing your FTP server from the internet using an FTP client such as CuteFTP? Try it both using Acitve and PASV FTP Modes. This will rule out any issues with Windows Explorer FTP (which can sometimes be problematic).

Another thought is try changing the 'Anywhere' in your FTP rule to 'External'.
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kwinswAuthor Commented:
Hi Eric,

Tried both suggestions with no joy. CuteFTP gives me the following message in active and passive modes:

STATUS:>        [07/10/2008 14:15:42] Getting listing ""...
STATUS:>        [07/10/2008 14:15:42] Connecting to FTP server... xx.xx.xx.xxx:21 (ip = xx.xx.xx.xxx)...
STATUS:>        [07/10/2008 14:15:42] Socket connected. Waiting for welcome message...
ERROR:>         [07/10/2008 14:16:03] Can't read from control socket. Socket error = #10054.

Port 21 is open for in and outbound traffic, so i'm not sure why it's doing this.

Thanks

Karl
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kwinswAuthor Commented:
Hi Eric,

Doh, that was it, or partly it. I have my router's firewall on the "medium" setting, which I thought allowed FTP Server by default, it didn't. I then had to point my server publishing rule to my server's external IP address (I'd pointed it to the internal one as part of my troubleshooting after reading in an article elsewhere that this was the right thing to do). Once I'd done these two things, it worked fine.

In the long term, I'd rather get my ftp off the domain server. At the moment, though, I don't have another machine which is always on, on which I can install a secure FTP server - so this is great.

Thank you for all your help.

Karl
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