Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Recently I have had some problems accessing websites. When I try to access them it says:

This webpage is not available.

I tried accessing the site through Firefox, Internet Explorer and Chrome. I also tried using a web proxy but I still have the same problem. This problem is only on my desktop PC; all the websites work fine on my laptop.

Currently, I cant access,,,,, and many forums.

I checked with the host file, but nothing is blocked in that. Can someone please suggest what is wrong?


share|improve this question

migrated from Apr 14 '10 at 13:39

This question came from our site for professional and enthusiast programmers.

Could it be that your cat has pulled the network cable from the back of your PC? Anyhow, I am nominating your question for migration to where you are more likely to find a solution :) – Jørn Schou-Rode Apr 14 '10 at 13:34
Check the DNS settings on the network connection. – ChrisF Apr 14 '10 at 13:36

First of all, are all sites unavailable, or just some?
If only a few sites are unavailable, the problem may be at their end.

If all web-sites have a problem, then you have to consider that your browser needs to look up the IP address of the site first, looking up the name from a DNS server. If there's no DNS server available, the lookup will fail.

Start with the basics. Start a Command Prompt (Start > Run > cmd.exe) and try to ping one of the problem web-sites:


If the ping command reports something like:

Ping request could not find host ...

...then you may fairly low-level network problem.

If however the ping command reports replies from some remote system, that proves your network connection and DNS look-ups are working OK.

So the next thing to check would be network/proxy settings. These can be (mis-)configured in your browser, but since you say all browsers are affected in the same way, it could be a Windows setting.

share|improve this answer

Check firewalls/virusscan/routers/connectioncable/dns settings etc.. maybe some newly installed software blocking the connection?

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.