After license server (Linux) reboot license daemon won't restart

Hello

I haven't VPN between client and licence server.

From client :

lmutil lmstat -a -c 1800@gnx6051
lmutil - Copyright (c) 1989-2019 Flexera. All Rights Reserved.
Flexible License Manager status on Mon 1/30/2023 17:07

License server status: 1800@gnx6051,1800@gnx6052,1800@gnx6053
License file(s) on gnx6051: /opt/licenses/altera/gnx6051.lic:

gnx6051: license server UP (MASTER) v11.18.2
gnx6052: license server UP v11.18.2
gnx6053: license server UP v11.18.2

Vendor daemon status (on gnx6051):

alterad: UP v11.18.2
Feature usage info:

...

From license server:

lmutil lmstat -a -c 1800@gnx6051
lmutil - Copyright (c) 1989-2021 Flexera. All Rights Reserved.
Flexible License Manager status on Mon 1/30/2023 17:04

License server status: 1800@gnx6051,1800@gnx6052,1800@gnx6053
License file(s) on gnx6051: /opt/licenses/altera/gnx6051.lic:

gnx6051: license server UP (MASTER) v11.18.2
gnx6052: license server UP v11.18.2
gnx6053: license server UP v11.18.2

Vendor daemon status (on gnx6051):

alterad: UP v11.18.2
Feature usage info:

...

Regards

Cedric