Dahua XVR User Manual page 284

Check DNS setup is right or not. Default Google DNS server is 8.8.8.8, 8.8.5.5.

You can use different DNS provided by your ISP.
34. I can not use the P2P function on my cell phone or the WEB.
There are following possibilities:
 Check the device P2P function is enabled or not. (Main
menu->Setting->Network->P2P)
 Check the device is in the WAN or not.
 Check cell phone P2P login mode is right or not.
 It is the specified device P2P login port or not when you are using P2P client.
 Check user name or password is right or not.
 Check P2P SN is right or not. You can use the cell phone to scan the QR code on
the device P2P interface (Main menu->Setting->Network->P2P), or you can use
the version information of the WEB to confirm. (For some previous series
products, the device SN is the main board SN, it may result in error.)
35. I connect the standard definition camera to the device, there is no video output.
There are following possibilities:
 Check the DVR supports standard definition signal or not. Only some series
product supports analog standard definition signal, HDCVI signal input.
 Check channel type is right or not. For the product supports analog standard
definition camera/HD camera, you need to go to the main
menu->Setting->Camera->Channel type to select corresponding channel type
(such as analog) and then restart the DVR. In this way, the DVR can recognize
the analog standard definition.
 Check camera power supplying, or camera data cable connection.
36. I can not connect to the IP camera.
There are following possibilities:
 Check DVR supports IP channel or not. Only some series products support A/D
switch function, it can switch analog channel to the IP channel to connect to the
IP camera. From Setting->Camera->Channel Type, select the last channel to
switch to the IP channel. Some series product products support IP channel
extension, it supports N+N mode.
 Check the IPC and the DVR is connected or not. Please go to the main
menu->Setting->Camera->Remote to search to view the IP camera is online or
not. Or you can go to the main menu->Info->Network->Test, you can input IP
camera IP address and then click the Test button to check you can connect to the
IP camera or not.
 Check IP channel setup is right or not (such as IP address, manufacturer, port,
user name, password, remote channel number and etc.).
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