If there are maintenance windows in which there will be unavailability between the senhasegura instances or ports, the orientation is that the database service between the affected instances is interrupted and the service is reestablished after the maintenance window is finished. For example, the client has an architecture with datacenter A with 2 secure passwords and B with 1 secure password, when starting the maintenance window in A, the database services in B must be stopped (systemctl stop mysql) .
After finishing the window, you must re-establish the database services in B (systemctl start mysql) and do a synchronization.
If the instances are not re-established, contact senhasegura support.