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Advice needed to secure my server

I am going to setup a server at my office for business use, I am going to use it as webserver , mail server and SQL server. the OS is  windows server 2003 small business edition premium.
my question is what is the best solution to secure my server from internet hackers and attacks ?
currently I am using linksys WRTP54G router which has a built in firewall, but I dont know if it is enough or not ? do I need to buy a hardware firewall to protect my server or software firewalls would do well ? and if I need to buy a hardware or software firewall , what do u suggest ?
3 Solutions
I haven't seen any Linksys or Netgear firewalls to be very strong from lab tests. Judging from the resources you are going to want to protect on that single server, you should go with an either best of breed or 2nd best of breed solution

Best of breed:
PIX, CheckPoint, Juniper/Netscreen

2nd best of breed

You should definitely go with a hardware firewall and the new PIX firewall version comes with a very good GUI. From my experience, Watchguard firewalls also do a pretty good job and aren't too difficult to manage. If you aren't confident of setting up one yourself, have a consultant do it for you. Once installed, you may not need too many changes after that.
Bill pretty much pegged it.
All three are good options. If you've got nothing but money you could also go to super best of breed and go with Sidewinder, but they are really pricey. and more for an enterprise solution.

Also when it comes to business practices, There are 2 main ones. Security in debth, meaning multiple layers of security, like a hardware FW and software, or FW and router etc etc. and the other is Deny by default, allow by exception. meaning you only allow the traffic that is needed and there has been a reason established as to why to open it.

Here is some info to help make your decision if you want to buy a FW..

Personally I would recommend a Juniper Netscreen

Here is a Firewall learning guide, to help out with some of the what they do's.

Here is a buying guide for FW's it can help you decide.

Here's some 3rd party studies of FW's

2006 Products of the year


Hope it helps,


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Product Highlights
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