This is a known design limitation for Flexnet Publisher where the connecting clients checkout a new set of licenses.

Conventionally, for a client to establish connection with Server over TCP IP, a socket is created at server and client for further communication. Now, once client detects that it has been disconnected from server/the connection signature changes (bad network OR change in network), client will close the existing connection (due to security reasons) and establish a new one.

This new socket connection will lead to checkout another set of license, if DUP_GROUP is not the conventional implementation in producer's environment.

To avoid a license deadlock/shortage scenarios, the licensing administrator can always take help of options file keyword, TIMEOUT, which will automatically check-in the licenses after certain period (same as defined in options file) and help avoiding license shortage scenarios.

Additional KB on this: https://community.revenera.com/s/article/additional-license-consumed-on-client-reconnection-post-heartbeat-interval

Version Fix

The above issue has been fixed in FNP 11.18.3.0 (2021 R4) so you could run a quick test in our latest version .(FNP-18904)