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Check for Wi-Fi issues using your Mac
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How to Find the Best Wi-Fi Channel with Wireless Diagnostics in Mac OS X
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How to fix Wi-Fi connection problems on a Mac
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June 14, PM. Then click advanced. You can also try creating a new user on the system and seeing if that user can connect ok. If the new user can connect, there may be a setting somewhere in your home folder affecting connection. You can also check the router's wifi setup.
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Routers can be set to different standards You can try disabling encryption to see if it will connect. Reply 2 of 7.
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June 15, PM. Marvin said:. Reply 3 of 7. Does this provide any further evidence to suggest what is at fault here? Reply 4 of 7. You'd share the network on the Macbook Pro from ethernet to wifi. This would turn the MBP into a router. You can then check if the iMac will connect to that wifi network. The culprit is an update for System Integrity Protection, the El Capitan feature that protects some system folders and keeps unsigned or incorrectly signed kernel extensions or "kexts," roughly analogous to drivers in a Windows or Linux machine from loading.
Apple uses a similar mechanism to update OS X's anti-malware blacklist, a rudimentary security feature introduced in following the high-profile Mac Defender malware infection and occasionally used to push other critical software updates. Why Apple blacklisted its own Ethernet kernel extension is anyone's guess; one theory suggests that the update may have been intended to go live after the release of OS X
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