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No problem Federico. 
I do have checked and there aren't any warnings in WMT. Everything looks right!

It's very weird that google ranked http://we.register.it in top position for top keywords and since few days google started to index https version (ignored until then). Google first moved all ranking to https version keeping exact same positions and then started to drop everything down.

Any idea?

Hi Federico,

What you are saying about the duplicate issue is definitely  right intact we have already planned to 301 redirect one or the other protocol version (http 301 to https or viceversa). Anyway it's very weird that google is realizing this after about 10 years.

Anyway It's not clear to me how Canonicalization it makes it worse.
On the https://www.register.it page there is the following canonical

This means that we are saying to google that the right page to index is http://we.register.it/ and https://www.register.it is a duplicate of http://we.register.it (which is the page was actually ranking until few days ago).
Am I wrong?

Thanks
Luca

Hi Mozers.

Since Google switched to the https version, our company website (http://we.register.it) indexing switched to the https version (https://www.register.it).

After that the ranking on Google dropped for almost every keyword.

The site is very old and got a great authority and PR 7. It ranked for same keywords for very long time

On each page from years there is the correct meta rel canonical. No spam, and WMT is ok.

Could you please help?

• The internal links are all in http, and in https. If you are https are in https (they are all relatives)
• No changes have been made and the subdomain is in that way from 8 years: the main url has always been http://we.register.it
• Google started this indexing switch around the 15 October