Your Network login has expired. Please enter your password to renew it!

[raspberry jam]

It should also cause a button that says Reconnect to Server (or something similar) to show up in your Friends List window.

It's fairly common and unless it is happening a lot I wouldn't worry about it.

I think that one is a key logger that ANet uses to try to figure out your password.

[BladeDVD]

Shhhhhh!!!