After the system boots, you may be prompted to allow incoming connections to numerous programs and services, so accept these for now you can always go to the Firewall settings and deny or remove entries later on and then try connecting to the network again. While configuration changes from migrating or restoring a system can lead to this problem, at other times major system crashes or power outages can do the same. Many cable modems bridge only the first MAC address they see.
If you unplug your router and plug in your Mac, you may need to reboot your cable modem so it accepts the Mac's MAC address.
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You'll need to reboot it again if you switch back to your router. Source: MacRumors forums. In my situation, I had unplugged the ethernet cable from my wifi router and plugged it into my Mac.
My cable modem presumably didn't bridge the new MAC address, leading to the network problem. Rebooting the cable modem resolved the issue. If these don't work, you might have a legitimate hardware issue. I would recommend a call to Apple they will help you over the phone generally, depending on how old your Mac is and whether or not you have Apple Care.
Alternatives: a visit to your local Mac shop there aren't many, but there are some or a visit to your local Apple Store. Listen now.
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Home Questions Tags Users Unanswered. Mac not connecting to internet with ethernet cable Ask Question. Asked 3 years, 11 months ago. Active 2 years, 2 months ago. Viewed 70k times. I have tried to manually enter all IPv4 information but doesn't help. Hennes Simply rebooting my computer worked for me. Keltari Keltari I was having the same issue and couldn't resolve until I followed this advice: Many cable modems bridge only the first MAC address they see. Source: MacRumors forums In my situation, I had unplugged the ethernet cable from my wifi router and plugged it into my Mac.
Here are some items to try in order: I would verify that the cable is making a good connection on both sides. Disconnect and reconnect both ends.
Things to Try
Try a different patch cord. One of these 4 is brand new out of the box and the other 3 are within 5 years of age.
Formatting is not an option. These machines are located throughout - various departments and on different floors. Some of the departments have a home run right back to the server; some go through an unmanaged 8 port switch that I installed which then home runs to the server. If I add them to our wifi system - no problems as I can connect wirelessly. As soon as I turn off their wifi the ethernet goes back to a self-assigned IP address. Any advice would be very much appreciated as I want all of my workstations to be hard wired.
Just because you give a computer a static IP address doesn't mean it can access the internet for various reasons. Is there a specific reason for self assigned IP? If you can, have your tried connecting those machines using DHCP?
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If DHCP is working, then your configuration for self assigned needs to be looked into. Principality Consulting is an IT service provider. It will take some time as I have 76 machines but I could just start with my problem workstations first, or do I have to do all of them at once in order to be effective?
What happens if you move the problem child to a different wired LAN segment? A: I will look into this. What I don't understand is why. I'm thinking to unjoin the domain and rejoin it again in hopes it will contact the DCHP server. All the workstations around him have no issues and they all home run to the server. You might want to check the settings on the port - are they set to auto negotiate, or are they stuck at a single speed full duplex?
source Check on the PC and also the switch. Is the NIC internal or expansion card? Try removing the network configuration an allow the machine to find it anew and reload the drivers, or if it is an internal NIC, disable it and install a new NIC an allow the system to find it.
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