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

I took a computer that was not updated for months. Internet was working just fine so basically, I updated zonealarm, avast and installed all windows updates and especially SP3. After that, when I reboot, Internet works fine but after few minutes, Firefox says that the connection was reset. IE does not work either. However, my connection is still up and running as I can make a ping on for example. Here are the solutions I tried with no success so far:

1) Uninstalling SP3;

2) Uninstalling IE8 and IE7;

3) Manually setting DNS and IPs;

4) Removed proxy settings from Firefox and IE;

5) Restarting DNS and DHCP related services;

6) Reset TCP/IP with netsh int ip reset c:\resetlog.txt;

7) Updated my ehternet card driver;

8) Restarted, tweaked all the connections in any directions and any configuration possible I believe;

9) Disabled Zone Alarm and Avast;

Also, update kb981793 always fails on install.

Please, help me as I spent two days already on this and I cannot find any solution. If I cannot fix this problem tomorrow, I will have to format-reinstall everything.

Thanks for any help.


share|improve this question
Has the network card driver been updated? Sometimes, a new driver can be flaky and cause the machine to drop the network connection. – cole Jul 21 '10 at 14:41
Yes, see point 7. – Korchkidu Jul 21 '10 at 14:43
I'd be willing to bet that the problem is with ZoneAlarm (ZA makes me sad :(). – squircle Jul 21 '10 at 17:40
Well, I disabled it and no difference... – Korchkidu Jul 21 '10 at 19:39
are you 100% sure there is no problem from ISP side? – tumchaaditya Jun 25 '12 at 6:20

I've seen this behaviour before on machines. Both cases it turned out to be ZoneAlarm. Not sure why those specific machines and not others. Very strange.

share|improve this answer
I completely disabled it. No change...;( – Korchkidu Jul 22 '10 at 12:22
I had to remove it, disabling didn't help. It appears to stick something into the system that interferes, whether running or not. – Brian Knoblauch Jul 22 '10 at 13:44
No change... I finally reinstalledt everything. – Korchkidu Jul 23 '10 at 7:32

Just a shot in the dark, but, clear your DNS cache and use some alternate DNS server(e.g. which is google's own DNS server)

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.