Jul 19, 2016  How to forget a Wi-Fi a network on Mac. Once your Mac has successfully connected to a Wi-Fi network, it will automatically connect to that network in the future. If you don't want this to happen, all you need to do it tell your Mac to forget the network. Click the Wi-Fi icon toward the upper right of your screen in the menu bar. It looks like a. The most common problem faced by users is Wi-Fi issues on Mac OS X El Capitan. There is poor Wi-Fi connectivity, Wi-Fi does not work in El Capitan or any other such problems which interrupts your work. In order to fix Wi-Fi issues on El Capitan, there are a few things which you can try out. It is not that hard to fix the problem. Try to ditch old preference files, and then create a new network location with custom DNS settings.

El Capitan’s built-in software firewall acts as the wall surrounding your castle — er, your Mac — by allowing in the communications you want while preventing unknown communications from potential threats. The firewall works with your Internet connection and with any networks you may have joined.

To display the Firewall settings, click the System Preferences icon on the Dock and then click the Security & Privacy icon. Click the Firewall tab to display these settings.

If your firewall hasn’t yet been turned on, click the Turn On Firewall button to start the ball rolling.

Is the Turn On Firewall button disabled? Don’t panic; just click the padlock icon in the lower-left corner. If El Capitan prompts you for your Admin user account password, type it and then click Unlock.

Click the Firewall Options button, and El Capitan presents three options you can set:

• Block All Incoming Connections: Turning this option on reduces the data you receive, cutting off access to the Internet for virtually all your applications. (In other words, blocking all incoming Internet connections is overly drastic security that prevents you from doing many nifty things.) Use this feature only if you suspect that your Mac is the target of an Internet hacking attack.
• Automatically Allow Signed Software to Receive Incoming Connections: Enable this one right now. After you do, software you’ve installed that’s accompanied by a valid security certificate (including any application from Apple and most major third-party software developers) is automatically added to the Allowed list you see on the Firewall Options sheet. If an application without a security certificate tries to access the Internet, your Mac displays a dialog prompting you for confirmation, and you can decide yes or no.

You can manually add an application to the Allowed list. Click the button with the plus sign at the bottom of the list and then navigate to the application that needs to communicate with the outside world. Click the application to select it and then click Add. Remember: Only third-party applications you install yourself will likely need to be added to the Allowed list, because all the applications that Apple includes with your Mac are already on the list.

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To delete an application from the Allowed list and return it to blocked status, select it in the list and click the button with the minus sign.

You can edit the settings in a specific application by clicking the pop-up menu on the right side of the entry. By default, the setting is Allow Incoming Connections (including both your local network and the Internet). However, you can choose Block Incoming Connections to prevent that application from receiving any communications.

• Enable Stealth Mode: Here’s an option that you might want to consider turning on. Stealth mode helps prevent hackers from attacking your Mac by preventing it from responding to simple identification queries across the Internet. Hackers often search the Internet for available computers that automatically respond to such queries.

If you suddenly can’t connect to other computers or share files that you originally could share, review the settings that you enabled on this pane: They may be the culprits. You can also verify that the correct sharing services are still enabled in the Sharing pane within System Preferences. (When you enable a service through the Sharing pane, El Capitan automatically adds that service to the Allowed list.

When you turn on Printer Sharing on the Sharing pane, for example, El Capitan adds a Printer Sharing entry to the firewall’s Allowed list.) Open the System Preferences window and click the Sharing icon, and make sure that the services you want to provide are selected.

So many of you would have upgraded to the latest Mac OS X El Capitan. And while it comes with many advanced features, there are also certain glitches which you might be facing with El Capitan. The most common problem faced by users is Wi-Fi issues on Mac OS X El Capitan. There is poor Wi-Fi connectivity, Wi-Fi does not work in El Capitan or any other such problems which interrupts your work.

In order to fix Wi-Fi issues on El Capitan, there are a few things which you can try out. It is not that hard to fix the problem. Try to ditch old preference files, and then create a new network location with custom DNS settings. An MTU change will solve Wi-Fi problems. But before doing this, you need to backup Mac with Time Machine.

So, first get rid of the current Wi-Fi preferences and make a fresh start

Create a folder on your Mac system to take back up of existing Wi-Fi preferences. Give it a suitable name. Next, switch off Wi-Fi from menu from the top right corner on the Mac screen. From Dock, click on Finder, and hit on Command+ Shift +G keys where you get Go to Folder command.

Select the path - /Library/preferences/SystemConfiguration/ and click on Return. You will be taken back to Folder, where you select these files –

apple.airport.preferences.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist

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Move these files to the folder which you created initially. You may delete these files. Next, restart Mac. If you turn on the Wi-Fi and there are problems still, then you have to create a new custom network.

Create new Wi-Fi network with custom DNS

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For this, first shut down all apps that are running on Wi-Fi. Click on Apple menu followed by System Preferences. From system preferences, click on Network. Next, click on Wi-Fi from the list, followed by Location menu and choose Edit Locations. Click on “+” sign in order to create a new location, give a suitable name for network and hit on Done button.

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Beside the Network Name, join the Wi-Fi network. Type the router password, and click on Advanced button on the Network screen. Click on TCP/IP tab, followed by Renew DHCP Lease button. When a warning message pops up, hit on Apply and continue.

Now, click on DNS button from Network screen and “+” from left lower corner under DNS Servers. Type 8.8.8.8 and 8.8.4.4 in the black space under DNS Servers. Next, hit on Hardware button, and under Mac Address, choose Manually. In the MTU tab, select Custom from the drop down menu and type the MTU number – 1453, and click on OK. Finally, click on Apply button to create a new Wi-Fi network.

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Your Wi-Fi should work fine after this. You can also check the speed to verify if internet is working or not.