Slow IIS on Vista with Firefox, Chrome or Safari

Ever noticed that sites are way slower in Firefox / Safari / Chrome and so on when you try to debug a website localhost on Vista.  Apperently there is some kind of DNS bug caused by IPv6. To fix it in Firefox you can type about:config and look up network.dns.disableIPv6 but this doesn’t fix the issues for other browser.

To fix it system-wide for all browsers edit your hosts file. You find it in %SystemRoot%\System32\drivers\etc.

127.0.0.1       localhost
::1             localhost <- Comment this line
127.0.0.1       .host

Thanks to commenter in this post for this.

3 Comments

  1. MK says:

    Many many thanks, the system-wide solution fixed it for my Chrome.

  2. Julio says:

    Thanks a lot!

    That was just the solution I needed!

  3. Wagner Danda says:

    Changing the hosts file the way you suggested did work. Here is what worked for me… uncomment this line in the hosts file:
    127.0.0.1 localhost

    More details on whit post:
    http://www.wagnerdanda.me/2009/12/asp-net-development-server-slow-on-windows-vista7-with-firefox-or-chrome/

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