I'm a bit shaky on this myself, so perhaps someone else will chime in... here's what I believe to understand:
- The gnome-keyring runs in the background as a service to applications to store and retrieve passwords.
- You can see the keyring and the passwords stored on it if you go to Manta Menu -> Accessories -> PGP Encryption Keys which will open the Seahorse application. In Seahorse select By Keyring under View. If you see a "locked" symbol next to the Passwords - Default entry right-click on "Default" and select "unlock".
- By default, the password for the login/default keyring should be your login password (i.e. the one which you set during the NX installation). I don't know what it would be if you run NX from a USB stick.
- Normally the Default keyring will be unlocked when you log into NX unless the keyring password has been set to something different from the login password. It may also not become unlocked if you have NX configured to start without you having to enter login credentials.
If you don't have or don't remember a password that unlocks the Default keyring, I believe you can still delete the keyring in Seahorse and set-up a new one with a password of your choice (ideally identical to your login password).
You should also be able to simply "escape" the keyring password prompt away. As far as I know the network manager that handles the wifi connections keeps track of its WEP/WPA wifi passwords internally and shouldn't need the keyring service.
I hope the above isn't horribly wrong - a second opinion will be appreciated...
### EDIT ###: From looking at some Linux forums it seems that you should be able to delete the existing default keyring and the system will automatically create a new one during the next login (which apparently you can give an empty password. It does look though as if the network/wifi manager
does need the keyring to store its passwords.