Follow these steps to take a service out of maintenance mode:

# svcadm clear network/uptmagnt/tcp 
# svcadm restart network/uptmagnt/tcp

Next, run the following command to verify it is running:

# svcs -l network/uptmagnt/tcp

The enabled and state fields in the output will indicate that the service is enabled and online:

fmri svc:/network/uptmagnt/tcp:default
name uptmagnt
enabled true
state online
next_state none
state_time Thu Oct 19 18:00:09 2006
restarter svc:/network/inetd:default
contract_id 1719889 1719886 1719885 1719879 1719878 1719877