Open ports

Machine page → External access: enter the port inside the machine and the protocol (TCP / UDP); an external port between 20000 and 29999 is assigned. Traffic to server-IP:external-port reaches that port on your machine.

• We only forward bytes; we can’t see the content of TCP sessions.
• Custom domains and automatic HTTPS aren’t supported yet.
• Your machines cannot reach each other (on purpose: one compromised machine can’t reach the next).
• Outbound port 25 is blocked, so you can’t send mail directly; 465 / 587 work.

UDP

UDP can’t trigger a wake. Machines with a UDP mapping never auto-suspend — otherwise your UDP service would silently go dark once the machine slept.