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The problem: The reason you can't access a specific website if you are using a cable or broadband connection is because your router is set to obtain your IP address automatically. Usually this isn't a big deal, but if your cable company did something funky recently to the way they cache'd the DNS or are working from an old cache, it can result in you not being able to access a certain website.
I haven't figured out why the way they cache the DNS should affect you being able to see the site you want and I don't really care, but apparently that's the reason for your troubles now.The solution: Set up a Static IP address. Luckily, this is pretty easy and painless.
Step by Step Instructions: I use Windows XP and this is how I did it.
1. Locate your current IP settings.
This will bring up a bunch of IP information. IP addresses are a series of numbers separated by dots.
2. Write down your IP settings.
3. Go to your connection.
4. Set your IP address to Static IP.
(Note: if this is already checked for you and there are already numbers in there I don't know why you can't access a specific site. I would write down the numbers there in case this doesn't work.)
If you only have one DNS Server Address and you get an error, try putting the one you already have listed in the second DNS address box and change the very last number to the next highest number.
For example, if your DNS Server Address is 188.8.131.52 Try to put this one in as your second DNS Server Address: 184.108.40.206
That should work. If it doesn't check out your cable company's Support page to find the address of two of their name servers. They should have these there. If not, contact them and ask them what the addresses are.
That's it. You should now be all set and you should be able to see the website you couldn't access earlier.
I hope this worked for you and you can now access the specific website you wanted to see.
Can't Access Website