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SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT on specific website

  • 6 replies
  • 11 have this problem
  • 5501 views
  • Last reply by Aschoonbeek

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Hi there,

I'm trying to troubleshoot an issue that seems to be specific to FireFox and a specific website.

If you browse to www.denali.gov with FireFox, and then on the right side of the page click on "Denali Commission Project Database", FireFox will first pop up a message that says: "Your connection is not secure"

Here is a direct link to the page: https://www.denali.gov/dcpdb/index.cfm?nossl=true&fuseAction=Indicators.ShowProjectMapLink

Then if you click on Advanced and click the "(Not secure) Try loading www.denali.gov using outdated security" that page will fail to load with the following error message:

"An error occurred during a connection to www.denali.gov. The server rejected the handshake because the client downgraded to a lower TLS version than the server supports. Error code: SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT"

Before anyone says "have you tried searching our forums or Google?", I've been researching this issue for the past hour and have not been able to come up with a solution. I checked the TSL settings on the "about:config" page and changed the version.min settings, but that does not fix the problem.

I have not been able to come up with anything, and so I turn to you guys... :-)


Has anyone seen this issue before and has a fix? The error is easily reproducible: Browse to the page using FireFox and I'm sure you'll see the same error.

However, the page loads fine in other browsers. Except, I don't want to use other browsers; I want to use FireFox.

Chosen solution

Hmm, I get "SSL_ERROR_NO_CYPHER_OVERLAP" and then a link that says "(Not secure) Try loading www.denali.gov using outdated security" and then when I try that I get the "SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT" error.

I think the real problem might be no ciphers in common between the server and Firefox. That's a problem I can't work around. Chrome (on my system, at least) supports just one of the site's four ciphers (bolded):

TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c) TLS_RSA_WITH_AES_128_GCM_SHA256 (0x9c) TLS_RSA_WITH_AES_256_CBC_SHA256 (0x3d) TLS_RSA_WITH_AES_256_GCM_SHA384 (0x9d)

Hopefully the operators of the site will add some other ciphers so more browsers can connect.

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I tried the link from the main page and got this; The owner of www.denali.gov has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

I've called the big guys to help you. Good luck.

There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.

http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html

https://support.mozilla.org/en-US/kb/server-not-found-connection-problem

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

http://kb.mozillazine.org/Error_loading_websites

https://support.mozilla.org/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.

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Hi FredMcD. When you get that message, you can go to "Advanced" and then try to connect not secure to get the SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT error.

Other browsers are able to connect just fine. It's not a timing issue either, unless your own computer clock is wrong as well. This error shows on every machine with FireFox (but not in Chrome or IE).

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Hi James. Thanks for that. So, if I understand that correctly those results are showing an issue with the website itself? Not something caused by FireFox?

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Chosen Solution

Hmm, I get "SSL_ERROR_NO_CYPHER_OVERLAP" and then a link that says "(Not secure) Try loading www.denali.gov using outdated security" and then when I try that I get the "SSL_ERROR_INAPPROPRIATE_FALLBACK_ALERT" error.

I think the real problem might be no ciphers in common between the server and Firefox. That's a problem I can't work around. Chrome (on my system, at least) supports just one of the site's four ciphers (bolded):

TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c) TLS_RSA_WITH_AES_128_GCM_SHA256 (0x9c) TLS_RSA_WITH_AES_256_CBC_SHA256 (0x3d) TLS_RSA_WITH_AES_256_GCM_SHA384 (0x9d)

Hopefully the operators of the site will add some other ciphers so more browsers can connect.

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Hi everyone; thanks for all your help!

Turns out it was the website, not FireFox. Apparently FF doesn't support as wide of an SSL cipher list as Chrome/IE do. That has been fixed on the website, so it's all good now.