Pretty sure this happened after the latest ADM Agent update (14.1-8.42) on wednesday. Noticed some instances lost connection to the license server. It would just say "Disconnected" in CLI (show ns licenseserver) and "Not Reachable" in GUI. Everything worked fine and weirdly they did not enter grace. I left them untouched for awhile to see if it resolved itself, but it did not. Tried rebooting the agents - but no luck. The only thing that worked was restarting the license process on the instances according to this article: https://support.citrix.com/article/CTX459963/adc-license-in-grace-despite-being-connected-not-moving-from-720-hours Be prepared for losing connection to both CLI and GUI when doing this (1 minute ish). Scared the shit out of me the first time, but from my experience it did not affect traffic. Might be worth checking if you are using ADM Service with pooled licensing. The pooled capacity overview in ADM had some discrepancies in regards to Managed License Usage/License Server Usage during this problem, so maybe start there.