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My webserver hosts many sites on a single IP address, can I install a certificate for each domain name?

April 26, 2017Certificate domain name hosts install ip address sites webserver

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My webserver hosts many sites on a single IP address, can I install a certificate for each domain name?

2 Answers

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The SSL protocol encrypts the domain name when an SSL session is being established. If you are hosting many websites each with their own SSL certificate on the same webserver, each website must have a unique IP to ensure that the webserver knows which domain the SSL session should be for. If you only host a single domain then you can use name based hosting. However if you host multiple domains on the same server then you must use IP based hosting. Please note that host headers on Microsoft IIS will NOT WORK if you install multiple SSL certificates for multiple domains on a single IP address.

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Posted

The SSL protocol encrypts the domain name when an SSL session is being established. If you are hosting many websites each with their own SSL certificate on the same webserver, each website must have a unique IP to ensure that the webserver knows which domain the SSL session should be for. If you only host a single domain then you can use name based hosting. However if you host multiple domains on the same server then you must use IP based hosting. Please note that host headers on Microsoft IIS will cause SSL errors if you install multiple SSL certificates for multiple domains on a single IP address.