No, you can still telnet. It depends on how a block is done. If it's done at the application layer, you would still get an initial connection. Open up firebug and hit the URL. Try to see what if any status errors you're getting.
Oh, I guess I assumed he was telnetting in, then doing a get...
What browser are you using? Some browsers (like chrome) do weird DNS caching that can, sometimes, cause problems.
The fact that you can get it from telnet, but not from your browser, means that you should be looking at your browser.