One that seems particularly vulnerable to odd problems is the system firewall.
Luckily the fix is a relatively easy one; all you have to do is remove the firewall's preferences and then reboot the system. After the system boots, you may be prompted to allow incoming connections to numerous programs and services, so accept these for now you can always go to the Firewall settings and deny or remove entries later on and then try connecting to the network again.
While configuration changes from migrating or restoring a system can lead to this problem, at other times major system crashes or power outages can do the same. Have a fix? Post them below or e-mail us! Be respectful, keep it civil and stay on topic.
How to fix Wifi self assigned IP address issue on Macbook Air with El Capitan | opacorylav.ml
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By Topher Kessler. It affects both Wi-Fi and Ethernet.
All my other devices works. Here's what I've tried: 1. Deleting the preferences files as described in all tutorials related to this issue. I've even shut down my Hackintosh, turned off the switch on PSU and pushed the power button couple of times to squeeze-out any "juice" left as some suggested this worked for them.
Resetting the router to factory settings.
Network Troubleshooting - Mac OS X
Updating macOS from No change, so I updated from Still nothing. I have another SSD which is a clone of the main one as a backup and when I've tried to boot into it, it worked without any problems no self-assigned IP after an hour or so. This leads me to believe, it must be a software problem?
Any ideas? I've noticed that my router DHCP lease time was set to one hour, hence the loss of connection after one hour.
I've increased it to two hours and it did work. So it loses the connection to the internet after DHCP lease expires. Is there any long-term solution?