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Hi all

In the last few days our Mailserver becomes a victim of a hacker attack. Someone sends useless requests to port 80 every second the whole day long. This attack produces an additional traffic of about 4 GB a day. After switching the standard webmail port to another higher port, the attack ended. Unfortunately we weren't able to identify the sender ip nor define a corresponding ipfw ruleset.

Because of being more comfortable for our clients, we would like to switch back to port 80, but we can not do this without securing the server.

Does anybody can help us defining an ipfw ruleset to prevent such an attack?

Thanks a lot,

[Updated on: Thu, 22 March 2007 11:06]

PHPStar - the missing gear in your web engine
My IT Indy

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I hate to say this, but port 80 is not a secure port. You really should be using HTTPS, which is port 443 instead. If you go back to port 80, that hacking attempt could grab a password and then use your mail server as a relay.

[Updated on: Thu, 22 March 2007 11:26]

My IT Indy
Kerio Certified Reseller and Hosted Provider

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You should be able to find out the IP address of the attacker through the debug log (enable web). If it is coming from a single IP address or address range, you could block port 80 for this address.

Dexion AG - The Blackberry Specialists in Switzerland

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I'd block all incoming traffic from the hackers IP on your firewalls and disable http via Kerio. What is wrong with only using https? I don't have http enabled on my customer sites.

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Yes, changing to https is a fast action to stop the attack without having hassle...
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