After Linux Operating System Patch upgrade Secondary Spectroserver status show "Not Ready" under Monitored Landscapes in OneClick console
23.3.x, 24.3.x
Firewall blocking the access
MapUpdate -v of Primary and Secondary Spectroservers are showing both entries
Check sestatus
If it is enabled change it to permissive or disabled
Check firewalld status
systemctl status firewalld
If it is running then stop firewalld
systemctl stop firewalld