As the secondary dns.
Ps4 lan cable internet connection failed.
Turn on your ps4 and then your router.
Remove the lan cable that s to be connected to the ps4 part out connect a laptop or computer to that end first check to see if you can get a connection to the internet or not if can then cable ok else then cable faulty or connection to homeplug side faulty endif now depending on the condition above only then try on your ps4 the same physical.
Try the following to improve your internet connection.
Trying to connect via an ethernet cable is always a more secure way of connecting your console to the router because it nullifies any signal loss and provides a lossless connection with the router.
Before turning your ps4 back on make sure your router is turned off.
Select settings network set up internet connection and then follow the on screen instructions to configure network settings.
From the ps4 home screen go to settings network set up internet connection.
Go to the ps4 menu settings network set up internet connection select wifi or lan cable we recommend lan set dns settings to manual and use 8 8 8 8 as the primary dns and 8 8 4 4.
If you need step by step guided help to troubleshoot your network issues try the fix and connect guided help.
If your ps4 is having trouble connecting to the internet you might want to narrow down where the problem is right away by determining if the issue is with your ps4 or with your wi fi network.
Make sure your ethernet cable is securely plugged into the network connector on the playstation console and your internet provider modem.
Select how you want to set up your connection.
Connecting with a lan cable for a wired connection select use a lan cable.
You can use either wi fi or a lan ethernet cable or to connect your ps4 system to the internet.
Select use a lan cable.
Try using an ethernet cable to directly connect your ps4 to your modem or router.
Wired connection lan your ps4 system has to be connected to your router via an ethernet cable.