Simply follow the steps below from an administrator account and put the mentioned files in trash.
You can use to solve the self-assigned IP address issue on your Mac running mac OS High Sierra, mac OS Mojave and also mac OS Catalina. On your Mac launch finder and click on Macintosh HD.
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Everything appears to be working fine except for one thing, my Apple Macbook Pro, running 10.5.8 is getting a self-assigned IP address when I connect it to my Fi OS wireless router (Action Tec MI424-WR).
The Mac has a physical connection to the wireless router.
When this happens, other systems on the same network (often including similarly configured Macs) will be working just fine, indicating the problem lies with the Mac’s configuration and is not a compatibility issue with the networking hardware.
Cause of the Problem: 1) System Update 2) Major Configuration changes made by users 3) System restore *4) Switched off System by holding power key When people perform major configuration changes to their systems, sometimes the settings may not migrate properly.
On the Network Preferences page the Wi-Fi will also show the Self-Assigned IP Address text instead of connected.
You can fix the self-assigned IP address issue and get the Internet to work again on your Mac by simply deleting a few files on your machine.