Install Firewall to avoid attacks from any type

IN PROGRESS
Project Budget (USD)
$50

Project Description:
Please install firewall security to avoid attacks to my server, the attempts are throught SSH or IMAP connections using a method to sent invalid user/pass which cause abuse on our server.

They sent the next email advertising for suspension:
There has been a complaint of abuse on your server.

Our policies require that clients respond to abuse complaints. Failure to do so within 24 hours will result in a suspension of services until you have time to resolve the issue.

The initial complaint is below. We will await your response indicating that you have either complied with the order, dispute it, or require a reasonable extension of time to resolve the issue.

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your Server with the IP: ip address has attacked one of our server/partner on the service:
"ssh" on Time: Mon, 21 Jan 2013 17:55:44 +0200. The time is from the Server of the blocklist-user
We received the Attack on the BlockList.de-System on: Mon, 21 Jan 2013 16:56:04 +0100

The IP was automatically blocked for a while time. To block an IP, it needs
most 3 failed Logins (ssh, imap....), some match for "invalid user" or a 5xx-Error-Code (eg.
Blacklist on mail...) in a short time! The Server-Owner can set the limits and not blocklist.de!

Please check the machine behind the IP my.ip.address (reverse dns) and fix the problem.
This is the 14 Attack (reported: 5) from this IP; see:
http://www.blocklist.de/en/view.html?ip=my.ip.address

Server access will sent throgth message.

Skills required:
Computer Security, Linux, System Admin, Web Security
Project offered by:
Verified