Access Server: What is the maximum loss of connectivity that can occur before impact is seen when a server goes offline?

Connectivity to validate licenses can be down for some period of time before impacting our users. What is the maximum loss of connectivity that can occur before impact is seen?

Once your Access Server has successfully activated a subscription, it remembers the last response received and continues functioning with that information, which continues across reboots. If your Access Server experiences an extended connection interruption communicating with our subscription server, it automatically enters into a grace period. 

During this time it functions normally and accepts new VPN connections as long as the number doesn’t exceed the subscription limit. The grace period is dynamically controlled by OpenVPN and as such can vary per situation. But you can count on a minimum of 2 days.

This means that a loss of connection of 2 days between your Access Server and our subscription server is no problem at all. In most situations, this grace period will even be significantly longer, in the order of weeks even.

Eventually, though your Access Server does need to successfully reconnect to the subscription server and refresh the subscription license state. Your Access Server automatically retries the connection at regular intervals. However, if the grace period expires and it’s not possible to restore connectivity, your Access Server reverts to only allowing two simultaneous connections.

More details can be found here.

Access Server Resources:
OpenVPN Access Server Documentation
OpenVPN Access Server Resource Center
OpenVPN Access Server Admin Manual