A backdoor means an open port so...
If anybody in including the admin checks the open port he will definitely notify the port and probably will close that port so...

Maintaining access means nothing?

If the security mafia could have their way, every device would just be bricked.

@Fast-Nop so you agree?

@R1100 Security folks often have tunnel vision on security and don't understand that availability is even more important.

Because once you sacrifice availability, the system becomes useless. So you could as well just pull the power plug and fire the security people.

@Fast-Nop or nobody would be using computers

Check out Port knocking. It allows you to open a port on demand, rather than leave one open.

@Gogeta70 but for that to work a port has to be opened somewhere right?

@Codex404 No, a port does not have to be open. Port knocking is used to open a port, but requires that you have code running on the target system to open the port when it sees the port knock.

@Gogeta70 wow! Super cool !!