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Can I use the same SSL cert for www1.domain.com and www2.domain.com?

Normally, an SSL certificate is for a specific host at a specific domain like www1.domain.com. If you try to use a certificate on one subdomain when it was issued for another, your visitors' browsers will warn them that the site name does not match the certificate and ask if they want to abort the connection.

Many certificate authorities are now offering wildcard certificates which are intended to allow you to buy one certificate that can be used on any subdomain under your domain name. The problem with wildcard certificates is that all browsers may not support them and some of your visitors may receive warnings or may not be able to connect to your site using SSL at all.

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