.
Thanks Craig. You were right. That fixed it.

> On Sat, 2010-02-20 at 21:08 -0700, Technomage wrote:
>> On 2/20/10 9:00 PM, Josef Lowder wrote:
>> > I have Firefox 3.5.6 running on two identical Thinkpad computers.
>> >
>> > It has been working fine on both for several months, but today, it
>> > just quit working on one of them with the message quoted below. Both
>> > are wirelessly connected on the same network. No changes were made on
>> > either one. I have rechecked that all the settings are identical on
>> > both computers.  The one on which Firefox just quit working works fine
>> > with Konqueror.  I have checked and rechecked everything I can think
>> > to check.  I tried reinstalling Firefox from Synaptic.  What could
>> > have caused Firefox to just quit working?  What can I do to get it
>> > working again?
>> >
>> > Server not found
>> > Firefox can't find the server at www.google.com.
>> > * Check the address for typing errors such as
>> >    ww.example.com instead of www.example.com
>> > * If you are unable to load any pages, check your computer's network
>> connection.
>> > * If your computer or network is protected by a firewall or proxy,
>> > make sure that Firefox is permitted to access the Web.
>
>> >
>> Its not a firefox issue. its a dns issue. How identical are the machines
>> in question?
>> running all the same processes? can you ssh from/to them?
>>
>> I see a lot of such errors, not just with mozilla firefox, but also with
>> safari, IE and even opera.
>> Generally, it turns out to be a dns lookup failure.
> ----
> that's not all that helpful because he clearly stated that Konqueror
> browses the web fine on the same computer where Firefox does not.
>
> Seems pretty clear from the evidence above that Firefox that isn't
> working is trying to use IPV6 DNS which is failing whereas Konqueror
> does not.
>
> - Open Firefox...
>
> - type 'about:config' in the address bar and lie to Firefox and tell it
> you'll be careful
>
> - type 'ipv6' in the 'filter box and you will see a setting for...
>
>   network.dns.disableIPv6
>
>   which is undoubtedly set to 'false. Double click it to change it to
> true.
>
> I would bet that this fixes the problem which would mean that the
> Firefox that works only has IPV4 running and the one that doesn't has
> both IPV4 and IPV6 running but you cannot resolve DNS via ipv6.
>
> Craig
>
>
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