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Visit Stack Exchange I tried to connect to a public Wi-Fi on my Mac Book Pro but can't do that.When I opened the network configuration it says something like "self assigned IP".
What is sounds like (IMHO) is that there may actually be an issue with the Wi Fi subsystem in the Mac.
Hardware or Software, dunno, it be elsewhere but we need to find where.
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.
For Resetting Wifi Configurations: step-1) Go to Desktop and press command shift G step-2) Go to the /Macintosh HD/Library/Preferences/System Configuration/ folder step-3) Backup and remove following files: com.apple.airport.preferences.plist com.message-tracer.plist Network Interfaces.plist preferences.plist step-4) Restart your computer.
Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Once the reboot has taken place the Internet will start working and self assigned IP address issue will be resolved.Recently one of our Macbook Air, a late 2014 model, running El Capitan started to experience intermittent problems connecting to the internet via the Wifi router.Find a friend with a phone or laptop with wifi and offer them beer. Once you have isolated where (EG which device) the problem is you will have removed one of the variables and be able to focus on the problematic device. I also assume that getting to the internet on the Mac is not an issue?What you are trying to discover is where the fault lies. 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.One that seems particularly vulnerable to odd problems is the system firewall.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. One common issue that has affected OS X systems is when network interfaces are issued a self-assigned IP address, even though the system is connected to a network with a properly configured DHCP server.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.