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FTP problems when using DNS ALIAS for ISA Server

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FTP problems when using DNS ALIAS for ISA Server - 5.Jun.2003 11:06:00 AM   
ssimons

 

Posts: 11
Joined: 5.Jun.2003
From: Belgium
Status: offline
Hi,

We have 2 Isa servers. let's say ISA011 and ISA02.
We use a A record in our dns called PROXY, wich points to the ip of ISA01 or ISA02 depending on wich machine we use in production.

All clients are configured to use PROXY.ourdomain.be
on the isa servers, the firewall client is configured as PROXY.ourdomain.be

so if you manually type (on the fw client) ISA01.ourdomain.be or ISA01.ourdomain.be it will automatically change to proxy.ourdomain.be

The pointer in our dns points to proxy.ourdomain.be (we change the ip when we change the proxy host's ip)

NOW THE PROBLEM:

when using this config, we have problems doing FTP (for example dos prompt ftp)

we can always make connection to the ftp.
but when trying to list the contents, something we get an error..
Or when uploading, we get an error saying our firewall doesn't allow to...

ANYONE CAN HELP ??
Post #: 1
RE: FTP problems when using DNS ALIAS for ISA Server - 5.Jun.2003 9:37:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Stijn,

check out my article http://www.isaserver.org/articles/How_the_FTP_protocol_Challenges_Firewall_Security.html .

BTW --- nice to meet another countrymen! [Roll Eyes]

HTH,
Stefaan

(in reply to ssimons)
Post #: 2
RE: FTP problems when using DNS ALIAS for ISA Server - 6.Jun.2003 9:05:00 AM   
ssimons

 

Posts: 11
Joined: 5.Jun.2003
From: Belgium
Status: offline
Ok, i read the article, but don't see what's causing me these troubles..

any idea?

Where in belgium are you from?
work for an it company?

Grtz,

S.

(in reply to ssimons)
Post #: 3
RE: FTP problems when using DNS ALIAS for ISA Server - 6.Jun.2003 8:29:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Stijn,

can you post an excerpt of the firewall log. Just make sure to enable the logging of all fields and set the log format to ISA format. In the MMC, go to the node Monitoring Configuration, then select Logs. In the details pane, right-click the applicable service and then click Properties. On the Fields tab, click Select All.

BTW --- I live in Harelbeke and work in Gent. For further info, check out http://www.isaserver.org/Stefaan_Pouseele/ [Wink]

HTH,
Stefaan

(in reply to ssimons)
Post #: 4

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