Hosting or Internet connection problem?

[cuongdm]

Hi,
I had a reseller hosting to run several sites.
But these days, sometimes i can't open them even I still can use FTP to upload files... My hosting provider said the issue was caused by the Internet connection but other sites (yahoo, goole, wht,...) can be opened smoothly... so I wonder what is happening...
Is there any tools/ways to let us know exactly where is the problem once we can't reach a website?
all replies are highly appriciated.
Thanx,

[LowCostGroup]

It either your connection or theirs, so use a connection you know is really fast and reliable, perhaps at another office or a friends house.
Maybe the problem is intermitant, so you may wish to write a script that loads a periodicaly page and times the transaction. If you want I think I have something I could adapt to do that kicking about, provided you think you have a computer you can leave it running on for a couple days.
Alternativly try a server monitering service. A quick google turns up the following:
http://www.internetseer.com/home/index.xtp

If the problems occur when accessing from another network, there is a good chance its their end.