Hi all, I solved my problem! Somehow the n770 saved my unsecured connection-settings in a file with the ssid-name. So the next time I changed my AC to secure WEP or WPA but kept the same ssid-name it failed to connect! See control panel > connectivity > connections. After I removed the setting-file and reconnected everything was fine. I noticed some disconnects from the AC (as others mentioned before). So I added the preferred connection and "use without asking" which works fine since then. I would be nice to get more specific information for failed wlan-connections, not just the simple one-line-error-notice, to get to the solution faster. --sd
