Negotiation Retry settings in Gateway Settings
If a negotiation for a VPN does not complete successfully, the VPN establishment is retried according to settings in the Negotiation Retry section in Gateway Settings properties.
The default settings are the recommended values. VPN establishment might fail because you have frequent intermittent problems with network connectivity or because your network connection is too slow. In these cases, increasing Negotiation Retry values might be a work-around solution for getting the VPN to establish.