Hello all, First of all, I would like to thank everyone for their responses. Today I recieved the first message from our Dutch IPS that our external IP is unblocked... A couple of other dbases to go...
As you al read in my first message, i'am not a security admin... the problem is that I work part-time administring a network which I have not build myself. But with all the suggestions handed to me I will talk to my supervisors to tighten the security around our network. Indeed, ISA-server is on my priority-list along with the rebuilding of the internal network. So, thanks for your input. I know I have a lot to learn about this subject bij this mailinglist is a very good start! Joost Ernest The Netherlands -----Original Message----- From: Devdas Bhagat [mailto:[EMAIL PROTECTED] Sent: dinsdag 1 april 2003 12:32 To: [EMAIL PROTECTED] Subject: Re: open proxy 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 ------------------------------------------------------------------- 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
