psk

the pre-shared key that is used for identity authentication between the VPN gateway and the on-premises data center. The key must be 1 to 100 characters in length and can contain digits, letters, and the following special characters: ~!\`@#$%^&*()_-+={}[]|;:',.<>/? If you do not specify a pre-shared key, the system randomly generates a 16-bit string as the pre-shared key. You can call the DescribeVpnConnection operation to query the pre-shared key that is automatically generated by the system.