The Enterprise mode of SSL VPN uses DH certificates for encryption. These certificates are created automatically during the installation or upgrade, with a default key size of 1024. You can create DH certificates with key sizes of your choice up to a maximum key size of 4096.
To create a DH certificate with a key size of your choice, enter the following command:
sslvpnc -k <keysize>
Replace <keysize> with the key size of your choice.