Hi, We have one domain with 600 domainaliasses. The maximum allowed in one certificate is 100 aliasses. Is there a solution to get a certificate for all these domains? Thanks

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See subjectAltName Certificates

It was a bad idea in the first place to put so many aliases to one domain. Every CA has an upper limit, just as every application and TLS library. So some of your clients will have trouble connecting to your server, even if you manage to get a certificate with your 600+ SANs.