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@vphoner, another possible reason your traffic might have decreased after securing your content is the non-support of older browsers, especially if your server doesn't support SNI. So that's the first source to investigate.
I'm switching two sites later this week. That's the first thing I check before I install the certs and work on the files.
Again, use the link above to SSL Labs to test your site's Certificate, Protocol Support, Key Exchange, and Cipher Strength. Any score less than an A- may result in lower ranking.
Is it only ancient browsers that cannot support SNI? And only XP operating systems?Yes, most of us are faced with this. In itself, this shouldn't account for very much loss in traffic.
Using (Symantec Basic DV SSL CA - G2) CertificateHere may be an important issue...
I did my 2 main sites in September. After quadruple checking everything and following a super detailed protocol, I had zero change in rankings.