High Availability for VitalPBX version 4 desparate situation

Has anybody achieved High Availability setup with VitalPBX version 4 using the provided script at GitHub - VitalPBX/vitalpbx4_drbd_ha: High Availability on VitalPBX 4 with DRBD ?
I am struggling for 20 days now and the result is that the slave computer is always down with no way to switch with the master. Master is working fine.