Reference10:General/Certificates/Create new

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This dialog is for creating self-signed certificates and certificate requests.

Type Self-signed certificate or signing request.
Key Select the key strength of the certificate here. Stronger keys are more secure but encryption/decryption is way slower. You can also reuse the key of the current certificate.
Signature The signature algorithm that should be used to sign the certificate. The standard algorithm is SHA1. You can also select SHA256, SHA384 and SHA512 that are more secure.
Validity The number of years the certificate shall be valid from now. Applies only to self-signed certificates.
Common Name The common name should match the host name of the box.
Other naming fields These fields are optional.
DNS Name If the box has got a DNS name you should enter it here. It will be stored as a SubjectAltName in the certificate.
IP address If the box has got a fixed IP address you should enter it here. It will be stored as a SubjectAltName in the certificate.

If you add any DNS names or IP addresses the browser will ignore the common name. Therefore you also have to add the domain from the common name as a DNS name.

For compatibility with Internet Explorer it is recommended to add IP addresses also as DNS names.