When looking web sites utilizing Firefox, for those who discover many of the net hyperlinks blocked, and also you obtain an error code SSL ERROR NO CYPHER OVERLAP, then there’s a drawback with one of many SSL / TLS settings within the browser. It is advisable to verify on few settings round TLS/ SSL to repair this error in Firefox.
Shut all of the tabs you might be engaged on, and save all of your work. Subsequent, open a brand new TAB, and kind about: config to open settings of Firefox. When you get a warning, settle for it. The following display will show all of the configuration settings.
Reset TLS Settings
1] Within the search field above the listing, sort TLS. This can reveal all of the settings which have TLS configuration. TLS stands for Transport layer socket.
2] Seek for any settings which have a price showing in BOLD. If sure, it implies that the setting has been modified. To revive it again to default settings, proper click on on it, and select Reset.
Reset SSL Settings
1] Repeat the search in about: config with SSL3. Search for configuration which has been modified i.e. they may seem in daring.
2] Proper click on on these settings, after which reset it. You too can double-click to revive to default settings. Nevertheless, the 2 settings wanted to be blocked to enhance safety. Set them to false.
Fascinating truth: These two are associated to the favored Logjam vulnerability which appeared three years in the past.
Change TLS Model Fallback
Altering TLS model to bypass is a superb possibility, however keep warned that it is best to do not do it for each web site.
Within the about: config part of Firefox, seek for safety.tls.model.fallback-limit.
Change the worth to zero.
Repeat this for safety.tls.model.min and set worth to zero.
Test for those who can entry the web site.
Warning: Altering these values will make your browser much less safe. So do it if it is rather obligatory. Make certain to reset it later.
Server Aspect Drawback
If that is taking place with one explicit web site solely, its a server aspect concern. Solely, the server admin can resolve the difficulty. This principally occurs when an internet site continues to be utilizing RC4-Solely Cipher Suite, and the settings within the server ‘safety.tls.unrestricted_rc4_fallback’ desire is toggled to false.
We’ve got seen this error reported at instances, for numerous web sites together with Cloudfare, Sonicwall, Tomcat, IMGUR, Amazon and so forth.