i think i did something wrong
after i added the custom certificate and i hit this coomand
signal-event certificate-update
i couldn't access the nethserver dashboard anymore
i got 2 files from rapidssl
certificate.crt and intermediate.crt
to get back to dashboard i had to use these command to remove custom certificate
db configuration setprop pki CrtFile ''
db configuration setprop pki KeyFile ''
db configuration setprop pki ChainFile ''