A manual connection is one where configure all of your VPN properties with out using any wizards.
Further, both ends of the connection require you to configure several elements that must match exactly. For example, your inbound keys must match the remote system's outbound keys or the connection will fail.
Manual connections use static keys that are not refreshed or changed while the connection is active. You must stop a manual connection in order to change its associated key. If you consider this a security risk, and both ends of the connection support the Internet Key Exchange (IKE) protocol, you may want to consider setting up a dynamic connection instead.
To define the properties for your manual connection, follow these steps:
In most cases, allow the VPN interface to generate your VPN packet rules automatically by selecting the Generate a policy filter that matches the data endpoints option on the Manual Connection - Connection page. However, if you select the The policy filter rule will be defined in Packet Rules option, then configure a policy filter rule by hand and then activate them.