When I updated my Mac, it won't connect to the internet when I've closed all Safari windows. I have to restart the computer every time to make it work.

Question

Every time I update my Mac different problems occur. This time when I got an update notification, I went ahead and updated what it wanted. Now when I'm done browsing the internet and close the windows and try to open a new one, it says the internet isn't working. I checked the network diagnostics and it says everything is working fine. I've noticed I have to restart my computer every time to get it the internet to work now. This never happened before I did the update.

Answer 1

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. First, disconnect all wired peripherals except keyboard, mouse, and monitor, if applicable. Boot in safe mode. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
During startup, you will see "Safe Boot" on the login screen, which appears even if you normally log in 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.
Safe mode is slower than normal, and some things won’t work at all, perhaps including wireless networking on certain Macs. If you usually connect to the Internet via WiFi, and it doesn’t work in safe mode, connect using an Ethernet cable. If you can’t do that, reboot as usual (i.e., not in safe mode) and perform a safe login, as follows: Enter your credentials at the login screen, then hold down the shift key and click the “Log in” button. Keep holding the key until the menu bar appears. In this mode, your login items, among other things, won’t load.
In safe mode, launch Safari and test. Same problem(s)?
After testing, reboot (if you booted in safe mode) or log out/log in (if you performed a safe login) as usual.