Okay. So the door is not wirelessly accessible. I'll assume that means whatever network it's on is also not. 
This is not the end, never fear. If the door can be accessed via a wire connection, Echo's still in the ballpark. She can use her trodes and commlink to form a direct neutral connection with a device, then create a little tiny network through those devices that she accesses with her Persona.
It's a little risky, cuz bricking her commlink will shut it down, but if she's sleazy enough and fast enough it should be enough.
For the sake of the post, shall we say that Echo can detect the presence of the network, but it's not open to any wireless access, making it inaccessible?

This is not the end, never fear. If the door can be accessed via a wire connection, Echo's still in the ballpark. She can use her trodes and commlink to form a direct neutral connection with a device, then create a little tiny network through those devices that she accesses with her Persona.
It's a little risky, cuz bricking her commlink will shut it down, but if she's sleazy enough and fast enough it should be enough.

For the sake of the post, shall we say that Echo can detect the presence of the network, but it's not open to any wireless access, making it inaccessible?