Microsoft SQL Server 2012 (all editions) or newer versions.
Hardware requirements
At least 4 Gb of RAM
At least 50 Gb of free disk space
Hardware requirements are identical to the ones for operating systems that the product is running at.
The AirKey Cloud server requires access to api.push.apple.com:443 in order to send push notifications.
Requirement for certificates for iOS devices
An appropriate certificate must be installed on the device and included in the list of trusted sources on your smartphone.
Requirements 4 and 5 were added in the Fall 2019 for certificates issued after July 1, 2019. Any certificates issued earlier than that will be accepted by iOS devices without object ID and expiration date.
TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits. Certificates using RSA key sizes smaller than 2048 bits are no longer trusted for TLS.
TLS server certificates and issuing CAs must use a hash algorithm from the SHA-2 family in the signature algorithm. SHA-1 signed certificates are no longer trusted for TLS.
TLS server certificates must present the DNS name of the server in the Subject Alternative Name extension of the certificate. DNS names in the CommonName of a certificate are no longer trusted.
TLS server certificates must contain an ExtendedKeyUsage (EKU) extension containing the id-kp-serverAuth OID.
TLS server certificates must have a validity period of 825 days or fewer (as expressed in the NotBefore and NotAfter fields of the certificate).