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Advanced: Firefox is getting the wrong ip address for image loaded

  • 10 uphendule
  • 1 inale nkinga
  • Igcine ukuphendulwa ngu blokecom

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Occassionally, but reproducable enough Firefox gets the wrong ip address for images that are loaded. It happens in firefox for mac/linux/windows and from multiple locations. It never happens in Chrome/Safari.

Load the above page, if you see "" then the bug has shown itself. If it doesn't happen, reload.

What is crazy is that it only happens for these ov10 and ov11 machines, and they get the other's ip.

I know what you are thinking, it's my DNS or something odd about my setup. Either on the client or server. But I believe I've eliminated that possibility. I'm still suspicious that we are doing something wrong, but when I see the wrong IP address in the dev tool, I'm not sure where else to look.

geoipdns config (authorative dns is ns1/ns2/ which I control). #ov10 #ov11 (there are no other entries), and true for all three name servers.

confirmed with dig, nslookup and ping. from multiple locations around the world. with at least 5 different ISP's. There are no entries in my /etc/hosts. The ip address is always correct. It's only wrong in firefox.

Any ideas?


All Replies (10)

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shows that firefox has the wrong ip address!

(I couldn't upload the image as it kept erroring)


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Is this with all websites/pages, some, a few?

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

If there is still a problem, Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?

While you are in safe mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

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Sorry, I should have explained that is my site.

But I haven't seen this anywhere else.

Thanks, I tried safe-mode, private window, disabling hardware accelleration, and in (safe-mode and private and hardware disabled) etc.. doesn't help.

I don't see how it could be cookie related. Because if you can set a cookie to get a host to have the wrong ip address, then that is a big security hole.

The only allowable cache issue that also isn't a huge security hole, would be if we changed IP addresses recently and it was getting the old one. But that's also not true. It has never changed.

We are a largish site, with some good technical ability, but I don't discount missing something easy.

So you see the issue when you load the page?



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It now strikes me that the ip addresses for ov10/11 are also used for the main site:

they are part of the round robin DNS for, so I'm a bit more suspicious that it's a firefox bug.



  1. please note that it is a geo dns server, so this is the answer in the US:

[cameron@flash ~]$ dig


ANSWER SECTION: 863 IN A 863 IN A 863 IN A 863 IN A 863 IN A

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I called for more help.

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I had to disable the test, and hack my way around the problem. Please let me know if someone wants to look into this, and I'll re-enable.

Cameron note to self: re-able gimp engines on ov10, ov11 to see the problem in a2.html

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Did you check the various sections on the about:networking page ?

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Perhaps you could be more specific. What am I looking for here?

But if you get the way networking and caching happens, you'll be suspicious from the following: about:networking#dns just showing the relevant rows and removed expires to make easier to read:

Hostname                  Family   TRR Addresses             ipv4 false
                              ipv4 false ipv4 false

and regularly gets the .56 ip address. Crazy right! see screen shot earlier. You can test it yourself. The above test ( fails for everybody, nearly every time. I'll leave the test up for 24 hours, unless someone seriously wants to look at the problem.


Okulungisiwe ngu blokecom

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Sorry, retry formating:

Hostname                  Family   TRR Addresses             ipv4 false
                              ipv4 false ipv4 false