Fix Self Assigned Ip Address Problem in Wifi Mac OS X [Solved]

By | October 21, 2015

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.

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. Luckily the fix is a relatively easy one; all you have to do is remove the firewall’s preferences and then reboot the system.

To reset the firewall,
step-1) Go to Desktop and press command+shift+G
step-2) Go to the /Macintosh HD/Library/Preferences/ folder
step-3) Remove the file called “com.apple.alf.plist”
step-4) Restart your computer.

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.

For Resetting Wifi Configurations:

step-1) Go to Desktop and press command+shift+G
step-2) Go to the /Macintosh HD/Library/Preferences/SystemConfiguration/ folder
step-3) Backup and remove following files:
com.apple.airport.preferences.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist
step-4) Restart your computer.

I hope this solves the problem. 🙂

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