2 Problems of my dedicated server

Ok so:

  1. “LAN servers are restricted to local clients (class C)” - this displays to my friends when they want to join to my server by hamachi! Is there any fix for this and is it possible to host dedicated server on hamachi?

  2. Why when i write in console type “net_start” i get this error “clound’t allocate any ip server ports” and why this crashing my server?

Maybe they shouldn’t be joining by hamachi.