This article will show how to change the network port numbers used for various purposes on the WinBook D5008DH DVR.Here is how to do this:1. Right click on the preview screen and click on Main Menu. 2. Select the admin username, enter the password and click OK. The default password for the account is 123456 if you have not previously changed it. NOTE: This prompt may not show if you are already logged in. Proceed to the next step once logged in. 3. Click on Configuration. 4. Click on Network. 5. Click on Setting next to Multicast. 6. Here you can modify the TCP, UDP, HTTP, and RTSP ports. Click OK when done. Note: The default ports will work with a standard network most of the time. Only change ports with informed advice from your network administrator.