All the FREE tools here are either already on your operating system or are tools that other websites provide. I list them here for your convenience. If you have any tests or tools you would like to see listed here, please pm me. Online Port Scanners:
In order to run a webserver, you need to make sure your ports are open. If they are closed, then you may have to use different port numbers. These tools will scan your ports and let you know if your ports are open or closed.
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MyServer.org - Good scanner, tests most ports, can submit your own port number to test.
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Sygate Online Services - Good scanner.
Online Security/Vulnerability Tests:
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DSLreports.com - Online security analysis.
Speed Tests:
Are you getting the speed that you paid for? Make sure you are by using these tests and see how close they are to the claimed speeds of your provider. A good rule is that if you get 90% of the claimed speed, your are in good shape.
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DSLreports.com Speed Test - Probably the most accurate test. This test measures both upstream and downstream speeds.
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Bandwidthplace.com - This is a very good speed test website!
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testmy.net - Upstream and downstream testing
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MSN.com Speed Test - Rough estimate of your speed. Probably the least accurate of the three. Tests both upstream and downstream speeds.
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Toast.net Performance Test - Allows you to choose from several different sources to test from.
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CNET Bandwidth Meter *
Computers4Sure Speed Test *
PC Pitstop's Internet Connection Center
Free Tests/Tools