Cannot do an internet search using Firefox.
Whenever I try to do a search using Firefox I get the following message: "We have detected you are using a 6to4 tunnel. 6to4 is deprecated and will be shut down shortly". This problem started after the last update. Can anybody please tell me what this message means, why it is appearing, and how to solve the problem? I cannot use Firefox for my searches anymore. I can only use the bookmarked websites that I have saved previously. Note: I am using Malwarebytes Premuim 41.0 as my anti-malware program and Windows Security. Thank you. Sol Crocker
Chosen solution
Using Google, I presume? I think this problem is caused by older router firmware that doesn't support IPv6 addresses.
If your router has an update available, that would be the best approach: https://www.reddit.com/r/firefox/comments/hmc3t0/google_search_forcing_captcha_dialog_6to4_tunnel/
If not, you could try disabling Firefox from using IPv6 addresses:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste ipv and pause while the list is filtered
Experiment #1:
(3) Double-click the network.dns.ipv4OnlyDomains preference to display an editing field, and enter
www.google.com
(or your actual Google search site if you use a different one) then press Enter or click the blue check mark button to save the change.
You may need to clear cache to make sure Firefox requests a new address:
How to clear the Firefox cache (this should be limited to cache and not include cookies/history)
Experiment #2 (if #1 doesn't work):
(4) Double-click the network.dns.disableIPv6 preference to switch the value from false to true
(You may need to clear cache to make sure Firefox requests a new address)
Does that work?
More info on about:config: Configuration Editor for Firefox.
Read this answer in context 👍 0All Replies (2)
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
Websites don't load - troubleshoot and fix error messages
http://kb.mozillazine.org/Error_loading_websites
Seçilmiş Həll
Using Google, I presume? I think this problem is caused by older router firmware that doesn't support IPv6 addresses.
If your router has an update available, that would be the best approach: https://www.reddit.com/r/firefox/comments/hmc3t0/google_search_forcing_captcha_dialog_6to4_tunnel/
If not, you could try disabling Firefox from using IPv6 addresses:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste ipv and pause while the list is filtered
Experiment #1:
(3) Double-click the network.dns.ipv4OnlyDomains preference to display an editing field, and enter
www.google.com
(or your actual Google search site if you use a different one) then press Enter or click the blue check mark button to save the change.
You may need to clear cache to make sure Firefox requests a new address:
How to clear the Firefox cache (this should be limited to cache and not include cookies/history)
Experiment #2 (if #1 doesn't work):
(4) Double-click the network.dns.disableIPv6 preference to switch the value from false to true
(You may need to clear cache to make sure Firefox requests a new address)
Does that work?
More info on about:config: Configuration Editor for Firefox.