Since yesterday I have been having problem connecting to some sites. I used to be able to get to these site (e.g ebay, youtube, paypal etc), but now I cannot. But I can get to many others.

Do you know what is going on? How can I fix this problem?
Thanks in advance.

try mozilla firefox

I have tried firefox as well. It did not work.
Very strange that some sites work and some don't. Any other suggestion?

can u elaborate what the problem is?
what it says when u want to open those sites mentioned in your question?
also can u give some details of your computer environment ?