Q: No internet connection after installing yosemite

I have a similar issue for all Apple apps.  However, Chrome works fine. 

I am having this exact same problem!

I have not tried Chrome yet, but I have Parallels installed with Windows 7 on it, and through that I can connect to the internet.  So, the VM I have running works, but Yosemite itself does not, at least none of the Yosemite apps I have tried, such as mail, safari, app store.  I don't think Firefox works, either.

I am experiencing the same problem. I'm connected to my router (airport express) yet when I open airport utilities it cannot locate the router.  I also do not have internet connection. However, in recovery mode, I can connect to the internet. Any help pls?

Other apps connect to the Internet Like Skype and Chrome.

I now have internet connection back.  I typed the following in terminal:

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

You are on to something here. 

I tried unloading, and it was not found.  I then loaded the file, and magically all my apple apps made their network connections and started working.

But here's where it gets funny. 

I logged off, and into another use account and I had no network connection.

I logged back into my account, and had no network connection.  I needed to unload and load the file again for the network to return.

More troubleshooting ahead...

OK, that worked for me, too.  How on Earth did you figure this out?  What is this library?

Thanks!!! This finally saved my day

Thank you so much. It did work for me and I hope it'd work for others too.

Thanks, you're a lifesaver.

Found it here:

https://coderwall.com/p/ylchfq

Unfortunately, you have to do this everytime you restart or log off your account. If anybody can share a more permanent fix, that would really help.

Sadly this does not work for me; any other ideas would be much appreciated!

I went into network connections and had it forget the WiFi connection, then re add the wifi and have had no problems since.

I had a switch in my setup and had same problem.  After upgrade I finally went into network system preferences.  Hit the assist me and set up a NEW "I connect through LAN" connection.  This solved the problem. Or at least so far!