NightWatcher D1 Digital Video Recorder User Manual52[Type] choose "DNS"[Enable]: ■ means it is chosen[Sever IP]: IP address of DDNS server[Port]: Port No. of device, related DDNS server listen port[User name] the user name that device can log in DDNS server[Password] the password related to the user name.[Refresh cycle]:Time interval between device and DDNS when chynchronously.Note: Please set up server before using DDNS.【Alarm center】When alarm occurring, report alarm information to alarm server.图 4.23 报警中心设置【Protocol type】GENERAL;【Enable】To tick it means enable.