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Question let's encrypt or SSL for a rewritten domain

Seba

Basic Pleskian
I'm using Centos 7 with Plesk (1and1 dedicated server) and Apache and we want to secure all our website with let's encrypt where possible, though we have a problem with 2 domain that has been rewritten with Apache rules.

here the code we use to rewrite the domain:

ServerAlias www.traffweb.portsmouth.gov.uk traffweb.portsmouth.gov.uk
RewriteEngine on
RewriteCond %{HTTP_HOST} ^(w{3}\.)?portsmouthtraffweb\.uk [NC]
RewriteRule (.*) http://www.traffweb.portsmouth.gov.uk/$1 [R=301,L]
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

In our server we have (and we own) portsmouthtraffweb.uk while traffweb.portsmouth.gov.uk it's own by the client, this subdomain doesn't exist anywhere, it's been redirect on the DNS with an ARecord to point to our server IP.

I tried to use Let's encrypt in Plesk but when I applied the certificate the rewritten rule is being ignore and the URL displayed is the one on the server not the one we want to display.

How can I secure those domains? A part from me that I use both domain to see the website, everyone else will use just the correct URL traffweb.portsmouth.gov.uk as it will be publicise with this DOMAIN NAME.

I don't mind to do some code on the server as we own the servers so I can connect as a root and as you can see this command was done on the server and not through Plesk, sometimes I just prefer do thing in Plesk because it require less time.
 
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