Re: open proxy

[Devdas Bhagat <dvb () users sourceforge net>]

On 30/03/03 12:31 +0200, Joost Ernest wrote:
> I have a question regarding to "open proxy". We are using Domino server
> as our mail server in a w2k server environment. A week ago we started to
> receive a-mail from a Dutch ISP dat our mailserver has been listed in an
> Open Proxy Database. As a result of this we can't send e-mail at all... 
You have an open proxy on your network. Possibly ISA? Have the proxy
accept requests *only* from your ip block.
With squid (http://www.squid-cache.org), I would do:
acl mylan src 192.168.1.0/24 #This is the netblock for my local LAN
http_access allow mylan #Permit my LAN users to use squid
http_access deny all #Deny everyone

> I have started to block some ports explicitly (135, 139, 443, 1080, 
> etc..) I also read some articles about this subject in which was written
First rule of firewalling: 
Block everything,
Open as needed.

> that i should use Authentication for every user that wants tos end
> E-mail. I know how to configure this in Exchange but i don't know how i
> can arrange this with Domino server. 
You need to authenticate on the basis of IP addresses, or username
password pairs.

http://www.google.com/search?q=smtp+auth+domino

HTH
Devdas Bhagat


-------------------------------------------------------------------
SurfControl E-mail Filter puts the brakes on spam,
viruses and malicious code. Safeguard your business
critical communications. Download a free 30-day trial:
http://www.securityfocus.com/SurfControl-security-basics