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

One of my various installed programs is periodically blocking access to certain websites that (I think) it has falsely determined to be malicious. I'm having trouble figuring out which one is blocking connections to the IP addresses in question though.

Knowing that if I try to visit a given website the connection is flat out refused on the client side because of an intervening process, how can I determine which process blocked the request?

I'm using Windows 7 Professional, 64 bit.

share|improve this question
Not entirely 100% sure so I won't write as an answer, but please let me know if it works and I will write it.... Take a look at Autoruns - Especially the "Network Providers" and "Winsock Providers" tab to see programs that are listening. – William Hilsum Mar 19 '11 at 21:21
I would first look at your Hosts file, that is the most common method that malicious software will use to block access to specific sites. You could also try a traceroute to that address just to be sure that it is stopping at your machine and not elsewhere. It would help to know what you are using to connect to that IP address (browser, ftp program, ssh, etc) as it might be a port issue and not something blocking an attempt at that IP. – MaQleod Mar 19 '11 at 21:28

Your Answer


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

Browse other questions tagged or ask your own question.