root@olive.x83.net# set system services ssh                

[edit]
root@olive.x83.net# set system services ssh connection-limit 100 (limit possible DOS attacks)

[edit]
root@olive.x83.net# set system services ssh rate-limit 3          

[edit]
root@olive.x83.net# commit
commit complete

Related posts:

1. First steps configuring Juniper Routers