TCP/IP filtering -- iis security

iis security : TCP/IP filtering

dave
8/18/2004 7:13:55 PM

hello
what are the minimum port required to make IIS as web
server. The site hosted on this server uses sql data
(which is hosted at other place) and CDO.Message object
to send mail.

I filtered TCP/IP and set
TCP port tht permits only 80,53,4656..

If I permit all UDP port, then it works fine but If i
restrict UDP port only permits to 53 port, then I'm not
able to send mail using CDO.Message...

Any help would be appreciated...

Karl Levinson [x y] mvp
8/19/2004 12:28:27 AM

The problem with IP filtering that isn't done using a firewall is that there
is no logging, which causes problems in these situations.

I would install and use a free sniffer like www.ethereal.com to see what
traffic is being generated. You might have to disable your filtering to see
all the traffic. Temporarily installing a firewall like www.sygate.com,
www.kerio.com etc. might also be an easier way to see what ports are being
used.

[quoted text, click to view]

Ken Schaefer
8/19/2004 1:35:04 PM

SMTP service uses both TCP and UDP for DNS lookup (by default)

http://support.microsoft.com/?id=330070
XADM: Mail May Not Be Delivered When DNS Resolution Uses Only the UDP
Protocol

Cheers
Ken

[quoted text, click to view]

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