dnsmd is Network Service Monitor and it is a part of Service Monitor. It is a daemon process which works all the time the system is running. It monitors availability of network services on hosts, on application level during its work. It also records response times of services, but a connection can't be realised, it records an error which follows. A list of hosts with a list of their TCP ports, that are monitored, is configured by a user by Network Service Monitor Configurator.