Reported in http://openelec.tv/forum/88-wlan/72207-wlan-advanced-configuration#113836 but I have seen similar reports in the past. The settings app GUI prevents you from entering a passphrase longer than 55-ish characters but the maximum permissible length of WPA or WPA2 keys is 63 ascii characters or 64 hex characters (and a minimum of 8 characters). If you create the connman service profile manually the connection works so this is definitely a settings-app issue.
Reported in http://openelec.tv/forum/88-wlan/72207-wlan-advanced-configuration#113836 but I have seen similar reports in the past. The settings app GUI prevents you from entering a passphrase longer than 55-ish characters but the maximum permissible length of WPA or WPA2 keys is 63 ascii characters or 64 hex characters (and a minimum of 8 characters). If you create the connman service profile manually the connection works so this is definitely a settings-app issue.