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Net affect of enabling SSL by default for all Plans

RationalPolymer

Basic Pleskian
Is there any downside to enabling SSL for all sites/all Plans even though there will be sites that will never use or require HTTPS? What is the "net affect" of enabling SSL?

Does this cause Apache configuration changes (eg; define vhost at port 443 where if SSL was NOT enabled there would be no such Apache configuration) even if the site does not have a certificate installed?
 
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