SSL cert

I have a CentOS, Directadmin webserver and a few IPs, my clients require SSL cert.

Do I need to buy one?
What's the advantages of buying one SSL cert?
Can 1 cert be used for as many websites?
How much does each cert cost?
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Dave BaldwinFixer of ProblemsCommented:
You need to buy at least one.  Self-signed certificates will cause pop-ups for an untrusted web site with each new browser visitor.  In some cases, cert can be for more than one web site.  Cost ranges from Godaddy's $69.99 a year very basic certificate to expensive Extended Validation certificates starting at $299 and up to way over $1000.  The cheap certificates just encrypt communication between browser and server.  The expensive certificates include insurance and since they are intended to identify your business securely, they also require that you submit a business and credit application to make you qualify for the service they are offering.  Financial instutions will have the expensive ones because they need to show that they have taken every effort to prevent fraud and loss.

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Patrick BogersDatacenter platform engineer LindowsCommented:

-For common pratice yes you should buy a certificate. Depending on your client needs this can be a basic, cheap, certificate or more expensive in case of extended. (meaning a nice green URL bar in explorer)
In some situations you could use a self-signed-certificate, discuss the option with your client.
- Advantage is encryption on, for example, login credentials.
- No, a standard certificate is for 1 domain. E.g.  so not for
You can buy a wildcard certificate like * meaning it is valid for and also for or any other subdomain. Wildcard certificate are very expensive.
- It depends where to buy, prices range for basic from approx. $50 to $2000 for wildcard.

Check with your hosting company what are your possibilities
You can get a free one here

They are as good and valid as any paid for cert.

You can get a UCC cert which can be used across multiple domains, think GoDaddy is the cheapest for these.
Extended validation certs - not necessary, they give no further security than a standard SSL cert, only difference as pointed out above is the validity of the site owner - you have to prove the business details, tax etc. (Amazon uses a standard cert)
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