Proxmox: restore cluster without rebooting

For some reason in these days I faced a problem with proxmox GUI and cluster management.
From one node of the cluster I saw on /var/log/syslog file that

 pveproxy[88540]: WARNING: proxy detected vanished client connection  

and if I try to access to the Web GUI of that node, it says "Login Incorrect".
From other nodes, it seems all right, but it isn't.
The solution is to simulate a reboot of all the machines without rebooting the VM on them: powerful!
So this is the sequence to launch on every node of the cluster, without some particular order

 /etc/init.d/cman restart  
 /etc/init.d/pvedaemon restart  
 /etc/init.d/pvestatd restart  
 /etc/init.d/pve-manager restart  
 /etc/init.d/pve-cluster restart  

Now, it works great.