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InstantSSL - General Frequently Asked Questions

Which versions of the SSL protocol is Instant SSL compatible with?

Instant SSL is compatible with any browsers and webservers using SSL version 3 - the de facto SSL implementation. SSL version 1 and version 2 have been superseded by version 3 for a number of years, mainly due to the inherent security flaws found in these old versions.

All web browsers developed after Internet Explorer 3 and Netscape 3 use SSL version 3 (however still support older SSL protocol versions). If your webserver is only capable of supporting versions 1 and 2 of the SSL protocol we strongly recommend you contact your webserver software vendor for an update - these protocols are flawed. For more details on why SSL version 2 is no longer used can be found here: