Macbook does not remember the network - it can be because of that
Occasionally, the MacBook may not remember its WiFi network. Turn the Mac on again or start it from sleep if it doesn't connect to the known network. You can find out how to solve the problem here:
MacBook cannot find its WLAN: Is the router active?
If the MacBook does not connect to a saved WLAN, the error does not necessarily have to lie with the computer. So start by troubleshooting your router first:
- Make sure your WiFi router is active.
- Check the network cable connections between the used network components such as WLAN router, modem and switch.
- Place your MacBook in close proximity to the router and check if the problem still persists. For example, shielding parts of the building can interfere with the radio connection between the router and MacBook.
Forget WiFi: First simple solutions on your Mac
If you did not find any errors during the previous check, check the following on your MacBook:
- Check whether Mac OS X is up to date and install the necessary updates if necessary.
- Deactivate and reactivate the airport adapter. To do this, click on the airport symbol in the menu bar and select the "Deactivate WLAN" option. Click the icon again and select "Activate WLAN". If the connection is now re-established, it may still be advisable to carry out the following steps.
If the MacBook no longer knows its WLAN: Possible solutions on your WLAN router
A direct connection to the router is required for this work. To do this, connect your MacBook to the router using an Ethernet adapter with a cable or via a USB interface. Then open the router menu via your browser.
- If the name of your WiFi network (SSID) is hidden, make it visible again.
- Change the SSID, choosing a unique name that is not used on any router nearby.
- Activate the automatic channel assignment in the router. You should only choose manual assignment if it is impossible that another router in the vicinity is using the same channel.
Magic Reboot for WLAN: delete network and password in the keychain
In addition, it can help to simply create a new network. First delete the network.
- Go to "Network" in the "Settings". Select "More options" there.
- In the WLAN tab you will now see a list of known networks. Click on the relevant network and delete it by clicking the [-] button below.
- To delete all traces of the network, you must now also remove the password from the keychain.
- Open "Programs" -> "Utilities" -> "Keychain Access".
- Enter "WiFi" in the Spotlight search window.
- Now right-click on the network that you previously deleted and select ["SSID-your-WLAN" delete "].
- Confirm the security question with [Delete] and then enter your password.
- Finally, right-click on "System" in the "Keychain" column and select "Protect your keychain system".
- Now re-create your network and check whether the problem persists.
Sort used WLAN networks by priority
If you register your Mac in several WLANs, you can determine the order in which Mac OS X tries to connect to these networks. You can read how to sort the networks by priority here