Question :

Lately I have had a bad and unstable internet connection. I have a Mac and it has been working fine for years. My internet provider is Vodafone-Ziggo.

I tried to find out what was wrong using the AirPortUtility.app on my Mac, and I found something strange : when selecting my wireless WiFi-network, my internet connection is presumed working, but when selecting my wired LAN-network, I get an error message saying there is no internet connection.

If it would have been the other way around, I could think of an explanation… but having wireless internet connection from my router and not LAN-internet just doesn’t make sense…

I’ve tried numerous resets of the Ziggo-modem, of my TimeCapsule and of my Mac. Nothing helps.

Do you have any suggestions on fixing this ?

Answer :

Even though you’ve tried most of the available options already, there is one other thing I would suggest to try :

• make sure the UTP/Ethernet/LAN-cable is correctly connected into both your Mac and the ‘local network device’ (be it a TimeCapsule, a router, a modem, a network-switch or a wall-socket)
• then, on your Mac : click on the Apple-icon (top-left on your Mac’s desktop screen)
• in the pulldown menu, click on “System Preferences”
• in the window that opens (“System Preferences”), click on “Network”
• in the window that opens (“Network”), click on “Ethernet” in the list on the left
• in the info that appears on the right, check if it says “Status : Connected”
• if it doesn’t, your UTP/Ethernet/LAN-cable isn’t connected properly, so check all network-cables again until it says “Status : Connected”
• then, click the Advanced-button
• in the window that opens, click on the DNS-tab
• in the info that opens, at “DNS Servers:” make sure that you have at least included one of the following DNS Servers : 8.8.8.8 (Google), 8.8.4.4 (Google), 208.67.222.222 (OpenDNS) and/or 208.67.220.220 (OpenDNS)
• if none of those DNS Servers are listed yet, add them by clicking on the +/Plus-button bottom-left
• then click on the Proxies-tab (of the elongated TCP/IP-button)
• in the info that opens, make sure to remove the check-mark at both “Web Proxy (HTTP)” and “Secure Web Proxy (HTTPS)”
• in case both were already switched OFF, I would suggest to switch both of them to ON
• then leave the rest as is, and click on the OK-button
• in the previous window that appears, click the “Apply”
• now check the AirPortUtility.app again, and you should see that the internet connection is back up for both the wireless and wired/LAN connection
• also check by opening Safari (or another internet browser) and refresh the page by clicking on the circular arrow in the address bar

That’s it !

enjoy 😉