After a refresh, almost all https sites give NS_ERROR_NET_INADEQUATE_SECURITY
It is not giving me an Advanced button or an "I know the risks" button, or any other way to respond. Among the sites that won't load is mozilla.org.
This is what the window says when I try to visit almost any https site:
Your connection is not secure
The website tried to negotiate an inadequate level of security.
www.mozilla.org uses security technology that is outdated and vulnerable to attack. An attacker could easily reveal information which you thought to be safe. The website administrator will need to fix the server first before you can visit the site.
Error code: NS_ERROR_NET_INADEQUATE_SECURITY
I looked at the troubleshooting information, "Important Modified Preferences", but there were no security.* preferences mentioned, or any mention of SSL/TLS.
I tried refreshing again but same result.
Oddly, app.napster.com loads OK (but I can't get it to play any music).
Using 57.0.1, 64-bit, Fedora 27, Linux kernel 4.14.8.
Chosen solution
Thanks so much, disabling SPDY indeed got my browser working again. However, I'm still uneasy about two things --
- There is no antivirus, etc. running on this machine
& Why did a refresh trigger this? The default value of the config option you mention is indeed true, so it was true after the refresh. But I'm almost positive I never disabled it before.
Oh well, there are enough real problem to worry about without bothering with conceptual ones!
Bob
Read this answer in context 👍 0All Replies (3)
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
NS-ERROR-NET-INADEQUATE-SECURITY INADEQUATE_SECURITY
A workaround to fix this ANNOYING issue is; network.http.spdy.enabled.http2 = false in about:config
Type about:config<enter> in the address bar. If a warning screen comes up, press the I Accept the Risk button. At the top of the screen is a search bar.
Chosen Solution
Thanks so much, disabling SPDY indeed got my browser working again. However, I'm still uneasy about two things --
- There is no antivirus, etc. running on this machine
& Why did a refresh trigger this? The default value of the config option you mention is indeed true, so it was true after the refresh. But I'm almost positive I never disabled it before.
Oh well, there are enough real problem to worry about without bothering with conceptual ones!
Bob
Modified by Blob2
NS_ERROR_NET_INADEQUATE_SECURITY indicates that the server initiates a HTTP/2 connection, but Firefox detects an invalid TLS configuration in the server response (server negotiated HTTP/2 with blacklisted cipher suites). This is likely not an issue with the certificate, but this is a problem with the server setup and there are invalid cipher suites for HTTP/2 claimed (INADEQUATE_SECURITY). http://httpwg.org/specs/rfc7540.html#TLSUsage There might also be other software that acts as a MITM and is interfering. When HTTP/2 is enabled and used then the requirements are much stricter than with HTTP/1.1 You can get the NS_ERROR_NET_INADEQUATE_SECURITY error message in case the server isn't configured properly.