Ethernet connection not found

I have an iMac (retina 5K, 27 inches, end of 2014).

After the start, today, I had no Internet connection. Network preferences showed not connected Ethernet port (it was). I also have the same cable to my MacBook and it worked perfectly.

Network Diagnostics didn't help: it simply says that the computer does not seem to be connected to Ethernet, etc., and ND couldn't do anything.

I have reset the SMC and the PRAM, nothing.

I removed the network Ethernet interface in the network preferences... and he couldn't add. The option is not simply there:

According to this post is not enough spot - we , I deleted

/Library/preferences/SystemConfiguration/NetworkInterfaces.plist

and

(/ Library/Preferences/SystemConfiguration/preferences.plist)

and restarted. Nothing.

I tried ifconfig in a Terminal and got this:

ifconfig

lo0: flags = 8049 < LOOPBACK, RUNNING, UP, MULTICAST > mtu 16384

options = 3 < RXCSUM, TXCSUM >

inet6: 1 prefixlen 128

INET 127.0.0.1 netmask 0xff000000

inet6 fe80::1% lo0 prefixlen 64 scopeid 0x1

ND6 options = 1 < PERFORMNUD >

gif0: flags = 8010 < POINTOPOINT, MULTICAST > mtu 1280

stf0: flags = 0 <>mtu 1280

EN1: flags = 8863 < UP, BROADCAST, SMART, RUNNING, SIMPLEX, MULTICAST > mtu 1500

ether b8:09:8 has: ba:a4: ff

inet6 fe80::ba09:8aff:feba:a4ff % en1 prefixlen 64 scopeid 0x4

INET 192.168.1.15 netmask 0xffffff00 broadcast 192.168.1.255

ND6 options = 1 < PERFORMNUD >

Media: AutoSelect

status: Active

EN2: flags = 963 < UP, BROADCAST, SMART, RUNNING, PROMISC, SIMPLEX > mtu 1500

options = 60 < TSO4, TSO6 >

ether 0: 00:00:75: ff: 50

Media: AutoSelect < full duplex >

status: inactive

EN3: flags = 963 < UP, BROADCAST, SMART, RUNNING, PROMISC, SIMPLEX > mtu 1500

options = 60 < TSO4, TSO6 >

ether 0: 00:00:75: ff: 51

Media: AutoSelect < full duplex >

status: inactive

fw0: flags = 8863 < UP, BROADCAST, SMART, RUNNING, SIMPLEX, MULTICAST > mtu 4078

LLADDR 00:0 a: 27:02:00:61:b8:1 d

ND6 options = 1 < PERFORMNUD >

Media: AutoSelect < full duplex >

status: inactive

P2P0: flags = 8843 < SQUARE, RELEASE, running, SIMPLEX, MULTICAST > mtu 2304

ether 0: 09:8's: ba:a4: ff

Media: AutoSelect

status: inactive

awdl0: flags = 8943 < UP BROADCAST RUNNING PROMISC, SIMPLEX >, MULTICAST mtu 1484

ether da: cc:a3:a3:90:8 d

inet6 fe80::d8cc:a3ff:fea3:908 %d awdl0 prefixlen 64 scopeid 0x9

ND6 options = 1 < PERFORMNUD >

Media: AutoSelect

status: Active

bridge0: flags = 8863 < UP, BROADCAST, SMART, RUNNING, SIMPLEX, MULTICAST > mtu 1500

options = 63 < TXCSUM, TSO4, RXCSUM, TSO6 >

ether ba: 09: 8A: ab:b5:00

Configuration:

0:0:0:0:0:0 priority 0 0 fwddelay hellotime ID 0

maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200

port root id 0:0:0:0:0:0 priority 0 ifcost 0 0

IPFilter disabled flags 0 x 2

Member: en2 flags = 3 < LEARNING, DISCOVER >

path of priority 0 ifmaxaddr 0 5 0 cost port

Member: en3 flags = 3 < LEARNING, DISCOVER >

ifmaxaddr 6 priority path cost 0 0 0 port

ND6 options = 1 < PERFORMNUD >

Media: < type unknown >

status: inactive

Any thoughts?

If you use 10.11.x:

Try this:

Start the computer in Safe Mode, and then restart normally. It will be slower than a normal startup.

MacIntel: Reset of the controller (SMC) system management

Reset the PRAM and NVRAM on your Mac.

Repair the hard drive and permissions - El Capitan

HD recovery start:

Restart the computer and after the buzzer, press on and hold down the COMMAND and R until the menu screen appears.

Repair

When the recovery menu appears, select disk utility and press the continue button. Disk utility charges and select Macintosh HD entry indented from the list on the left.  Click the first aid tab in the toolbar... If disk utility reports any errors that have been corrected, then re-run first aid until no errors are reported. Wait until the operation is complete, then quit disk utility and return to the main menu. Select restart from the Apple menu.

Now, download and reinstall OS X El Capitan 10.11.3 Combo Update.

If the problem persists then discovered this: Re-built-in ethernet disappeared.

Tags: Mac

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