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You can have a backup certificate from a different CA but you cannot serve multiple leaf certificates (i.e. certificates matching the hostname) within the same TLS connection. You can also not have multiple signatures (i.e. by different CA's) on the same certificate which is a similar question often asked in this context. But you could use different ...


TLS only allows a single cert. You'd need to have some monitoring in place to check for this issue and automatically reconfigure your web server upon occurrence. You can get the same CSR signed by multiple CAs. Each time you will get a separate cert signed by that single CA. You are likely better off with completely independent keypairs and CSRs for each ...

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