UCP: the settings of the checks

UCP (Uptime Check) runs the checks of the customers from this server: the pings, the connections, the HTTP and DNS requests leave from here and reach the addresses the customers write. How hosts and checks are used is described in the customer manual.

All the hosts

Modules › Hosts lists the hosts of all the subscriptions, with the State, the Checks in each state and since when (Since). At the top, the Hosts down and the Checks with a problem: both open Modules › Problems. You can search by name or address and filter by state and by customer.

Checks towards private addresses

Modules › Check settings has a single choice, an important one: Allow checks towards private addresses.

Choice	When
On	The panel is installed in the network of the company that uses it: the customers can check the machines of the internal network, such as 192.168.x.x and 10.x.x.x
Off	The panel hosts customers who do not know each other: only public addresses are accepted, and not those of this server

On a panel that hosts several customers leave it off: on, a customer could use their checks to probe the internal network of the server.

The panel itself (127.0.0.1) is never a destination. Turning the choice off, the hosts already saved are not deleted: their checks answer Unknown with the reason.

The resolver

The DNS checks "to the resolver of the panel", and the names of the hosts, use the resolver of the server. To let the customers check names that exist only in the internal network, add the Private domains in Server › DNS (see Certificates, mail and DNS).

The outbound firewall

The checks leave from the server: if the server is behind a firewall that limits outbound traffic, the checks towards the blocked ports fail. Check the outbound rules before giving UCP to the customers.