That was the point, thank you!
Well actually I tried to set permissions for all users from the beginning (yes, is newly setup), but this is what the KDE gui makes by cheking the box "All users may connect to this network":
Code:
# cd /etc/NetworkManager/system-connections
# diff my_ssid~ myssid
5c5
< permissions=user:my_user:;
---
> permissions=
7d6
< autoconnect-priority=1
17a17
> auth-alg=shared
21a22
> wep-key-type=1
And after that the connection stop working at all! It get stuck in "Configuring interface" (why that??)
So the solution was to manually modify only the line 5 (see the diff).