Q: No internet connection until renew DHCP lease on Air Port Exreme

if you APE has not been rebooted do so now and reset it, reboot your cable modem or whatever device the APE gets an IP address from.

I have the same issue here on my MB Pro Retina 13" Late 2013 running OS X 10.11.1. — My wife has an older MB Pro 13" Mid 2010 running OS X 10.11.1 and has no issues with wifi reconnection after sleep or low power mode.

The only work around I have is to force the DHCP to renew a lease by turning off/on the wifi to my machine.

Curious if anyone else has suggestions?

@Gordon, I'm not sure then but you tried what you should have. I would look at any 3rd party software that is acting on behalf of your network if you have any.

@Jayrom Does your wife computer exhibit this if you plug it into a cable? is it only the wi-fi or can you reproduce with ethernet?

@JimmyCMPIT - Her machine is used on both a LAN connection and Wifi and has no issues connecting to our SSID. Connects and obtains an IP (over wifi) no matter the case.

It is my MB Pro Retina that refuses to connect to the SSID until I toggle the wifi off/on.

Thx!

Please read this whole message before doing anything.

This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.

The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

Do you have the same problem on other networks, or only on yours?

Resetting an AirPort base station FAQ - Apple Support

If the reset doesn't help, it's time to replace the device.

Finally someone with the same issue - all iPads, iPhones and old macbooks works fine. My new Retina ones (2012 and 2015) keep dropping the internet connection, and only way to get it back is to start airport utility OR disconnect/connect to Wifi again. Drives me nuts!