Sometimes, after restarting all the Centreon-related services (Mysqld, Centcore, Centstorage, ndo2db, Nagios, Apache), you may have a long listing of error messages in the UNKNOWN status such as :
ERROR: Received noSuchName(2) error-status at error-index 1.
ERROR: Received noSuchName(2) error-status at error-index 4.
It concerns all the information monitored through SNMP. One solution to wipe them out of your Centreon dashboard is to stop all the Centreon-related services. Then, delete all the files contained in /var/lib./centreon/centplugins/:
root@localhost:~# rm -rf /var/lib/centreon/centplugins/*
Then restart Centreon and everything should be nice again.