SCP works one way only

[Konstantin Svist]

For some reason, I can only SCP files off my new NAS, not to it.
I've tried both using it as a server and as a client with same result.

When sending a file to it from another computer, scp reports a certain 
amount transferred (1.9M) and then immediately stalls. The target file 
stays 0-bytes in length.
When trying to "download" a file from another computer, scp reports 0 
bytes transferred.

Other download commands (e.g. yum update) work just fine.

arch: x86_64

P.S. The install in question is F12, but since it's 1 day away from 
release, I'm asking here.