Ethernet cable doesn't appear connected?

Over the last few days I have had an intermittnet difficulty conencting to thr Internet.
I discovered that although it's physically plugged in, the ethernet cable isn't - the System Network reports, 'The cable for the Built-in Ethernet is not plugged in'.
I changed th cable and find it does work okay on a differnet mac. Somehow the physical connection, which looks okay, seems not to be working.
Does anyone have any ideas as to what might be wrong and what options I have for a fix?
Would an ethernet card provide a viable alternative ethernet connector?
Thanks

Hi Richard,
I had the same problem as you today. My network status in network showed that my ethernet cable was not connected as well. I did some troubleshooting and my Dell was working ok, my G4 laptop & MBP was working as well because I had everthing hooked up via a router and a DSL modem.
Come to find out, somehow my settings were changed without my knowledge in network. What I did was to change was settings back under network to built in Ethernet. Under TCP/IP tab, I changed the setting to Using DHCP and under PPPoE tab, turn off connect using PPPoe, do this first. After resetting these settings I checked show: network status and everything works like before. It wasn't my Ethernet cable after all. I hope this helps

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Solved!
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Any normal network cable will do really as long as it looks like reasonable quality. Sometimes called an RJ45 cable, or cat5 cable. You might be able to get a back to back connector and just buy a lead to extend the one they've sent to you. A back to back just connects two ethernet cables together. Powerlines are OK under some circumstances but are not recommended or supported by BT.
Available from Amazon for £1.70
20M CAT5e RJ45 ETHERNET LAN NETWORK PATCH LEAD CABLE

Internet not working - wifi connected but internet and server fail, ethernet cable doesn't work either

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Hi ehamzic1,
Welcome to the Apple Support Communities!
I understand how frustrating it can be when your computer cannot connect to the internet. In your situation, you will need to isolate to find what is causing the issues connecting. I would recommend reading over and working through the attached article. The article should help you troubleshoot and resolve this situation.
Solutions for connecting to the Internet, setting up a small network, and troubleshooting
http://support.apple.com/kb/HT1714
Have a great day,
Joe

[SOLVED]Wifi sharing over ethernet cable doesn't work Gnome 3.16.1

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Someone who uses gnome MAY pop in, but really this is an issue with how gnome works (and when) so you may have to go to them (gnome's official support outlet) to get answers as to why its not working.... I do seem to remember seeing a post very similar to this with gnome, so maybe its some kind of bug right now? Perhaps check their bug reports?
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Internet Service Provider and Modem Configurations
What ISP Service do you have? Cable or DSL?
What ISP Modem Mfr. and model # do you have?
Is ISP Modem/Service using Dynamic or Static WAN IP addressing?
What ISP Modem service link speeds UP and Down do you have?
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Router and Wired Configurations
Setup DHCP reserved IP addresses for all devices ON the router. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting and maintain consistency for applications that need to connect as well as mapped drives.
Ensure devices are set to auto obtain an IP address.
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PC 3rd Party Security Software Configurations
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Router Placement
Forum User - "Well I feel really dumb. After moving the router away from other electronic devices my speeds are back to normal. Just a heads up for anyone experiencing slow speeds, you might want to move it away from other electronics and see if that helps."
3-6' feet minimum safe distance between devices.
Placement on main level floor and central in the building and WELL ventilated is preferred. Not in basements or closets as building materials, or near by electronics devices could interfere or hinder good signal propagation.

Why does Time Machine not work over wifi but only via ethernet cable ?

Hi everyone,
It's been some time I have this problem now.
The first time I backed up my mac within Time Capsule with time machine, I chose to use the ethernet cable because the gigabit connection is much faster than the wifi for the first back up, but now, any time I want to update this back up, I need to connect the cable, cause "Time Machine can not connect to the Drive I picked" over wifi.
This is so annoying. Does anyone have a similar issue ?
Any solution ?
When I got this "error" I can use Utility Airport and get full access to the drive, even in finder. The only thing that doesn't work is TimeMachine connecting to the drive, even if it is detected by TimeMachine itself.
Thanks.
Riccardo

Typical Yosemite.
I suggest a full reconfigure of the TC.
Follow this list..
No files are deleted on the TC doing this although you might have to repoint your laptop to the backup.
Note.. even if TM does connect it will say it is going to do a new backup.. it is only when it starts that it discovers the backup exists and increments it.
Start from a factory reset. No files are lost on the hard disk doing this.
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Setup the TC again.
Then redo the setup from the computer with Yosemite.
1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
eg TCgen5 for basestation and and TCwifi wireless name.
If the issue is wireless use TC24ghz and TC5ghz with fixed channels as this also seems to help stop the nonsense. But this can be tried in the second round. ie plan on a first and second round of changes to fix this.. hopefully.. I will point out other steps that can be round2.
2. Use all passwords that also comply with 1. but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
3. If the TC is main router you can skip this point. This is only an issue when the TC is bridged.
Ensure the TC always takes the same IP address.. you will need to do this on the main router using dhcp reservation.. or a bit more complex setup using static IP in the TC. But this is important.. having IP drift all over the place when Yosemite cannot remember its own name for 5 min after a reboot makes for poor networking.
4. Check your share name on the computer is not changing.. make sure it also complies with the above.. short no spaces and pure alphanumeric.. but this change will mess up your TM backup.. so be prepared to do a new full backup. Sorry.. keep this one for second round if you want to avoid a new backup.
5. Mount the TC disk in the computer manually.
In Finder, Go, Connect to server from the top menu,
Type in SMB://192.168.0.254 (or whatever the TC ip is which you have now made static. As a router by default it is 10.0.1.1 and I encourage people to stick with that unless you know what you are doing).
You can use name.. SMB://TCgen5.local where you replace TCgen5 with your TC name.. local is the default domain of the TC and doesn't change.
However names are not so easy as IP address.. nor as reliable. At least not in Yosemite they aren't. The domain can also be an issue if you are not plugged or wireless directly to the TC.
6. Make sure IPv6 is set to link-local only in the computer. For example wireless open the network preferences, wireless and advanced / TCP/IP.. and fix the IPv6. to link-local only. Do the same for ethernet if you use it.
There is a lot more jiggery pokery you can try but the above is a good start.. if you find it still unreliable.. don't be surprised.
You might need to do some more work on the computer itself. eg Reset the PRAM.. has helped some people. Clean install of the OS is also helpful if you upgrade installed.
Tell us how you go.
Someone posted a solution.. See this thread.
Macbook can't find Time Capsule anymore
Start from the bottom and work up.. I have a list of good network practice changes but I have avoided Yosemites bug heaven.
Yosemite has serious DNS bug in the networking application.. here is the lets say more arcane method of fixing it by doing a network transplant from mavericks.
http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/

AEX not recognizing internet via ethernet cable

This is an odd one.
I'm housesitting and my friends have a dsl box with ethernet out to connect to the net. If I plug the ethernet cable into my computer I'm online, period.
If I plug my AEX into the ethernet cable, I can't access the net. I can connect to the AEX fine, but it doesn't recognize that there's an internet connection.
When I plug my AEX into the ethernet cable at work, it connects to the net immediately.
Any idea what to do to resolve this?
Thanks,
Tom

A couple of reasons may be causing this:
1. Since you switched out the device (computer vs AX) connected to the DSL modem, you might have not provided enough time for a complete power recycle...so that the modem can "recognize" the AX.
Modem/Router Power Recycling - Quick
o Power-off the DSL/Cable modem, Internet router, & computer(s); Wait at least 5 minutes.
o Power-on the DSL/Cable modem; Wait at least 5 minutes.
o Power-on the Internet router; Wait at least 5 minutes.
o Power-on the computer(s)
If this fails to get the modem to "recognize" the Internet router, then try the "Full" version.
Modem/Router Power ReCycling - Full
o Power-off the DSL/Cable modem, Internet router, & computer(s). (Wait at least 30 minutes. If possible, leave the modem off overnight.)
o Power-on the DSL/Cable modem; Wait at least 30 minutes.
o Power-on the Internet router; Wait at least 5 minutes.
o Power-on the computer(s)
2. The ISP requirements for Internet connectivity may be totally different (PPPoE vs DHCP) between your friend's network and the one you use at work.

My ethernet cable seems to be too small for my Time Capsule?

Recently, I attempted to hook up my new Time capsule to my new iMac. The ethernet cable I used to connect to the ethernet wall socket I used with my previous router appeared to be too small to fit into the Time Capsule's ethernet plug. When I inserted it, no green light came on to tell me it was connected, and the Time Capsule continued to flash amber. I'm fairly sure the ethernet cord comes out from (what was meant to be) a phone jack. Could this be the reason for the small plug?
Is the solution to this as simple as just buying a proper plug to fit, or do I have to do something else?
The small plug itself looks like this: http://www.instructables.com/files/deriv/FHX/BNCU/FXA2ZSBL/FHXBNCUFXA2ZSBL.LARGE .jpg
Any help is much appreciated.

Your "Ethernet" cable is a phone cable. It cannot be plugged directly into the Time Capsule, since the Time Capsule is a router only. It does not have a modem on board.
Your previous router was a "modem/router" which combined the functions of a separate modem and router in one package.
The phone cable must plug into a modem and then the modem will have a larger Ethernet port to connect a cable from the modem to the WAN "O" port on the Time Capsule.
If you still have your old modem/router there, you can use it as a modem for the Time Capsule.

Air Parrot performance with Ethernet cable ?

Hello Everyone,
I am very impressed by mirroring functionality provided by Airplay of apple tv. I have a 2010 Macbook pro purchased in mid 2010. Unfortunately, my mac doesn't have quicksynch tehncology hardware support for airplay to work in mountain lion. So, I never upgrader to ML. However, I have been playing around with Air Parrot. I have noticed a lot of choppiness while playing videos.
Both my macbook and apple tv are currently using Wi-Fi. I am guessing the lack of smoothness in video mirroring is because of wi-fi. Has any one tested by using ethernet cables. I mean connecting both MB and ATv to broadband modem using ethernet cables? Did it improve video quality ?
Thanks in advance.

I got a Mid-2010 iMac (i3) and a ATV3. I faced some performance issues while streaming HD-video content from the web (3 Mbit DSL) and tranfering by WiFi (incl. a APExpress as repeater) to Mac and back to ATV via Airparrot (mirroring). So I have tried Dlan (Devolo 500) as an alternative to WiFi. Performance has improved significantly ! Now I am quite happy (but still anoyed that Apple does not support older machines with mirroring on ML).
But i guess my i3-iMac is now quite at the border of it's video coding/decoding performance.
---> give Ethernet (or Dlan) a try.
iMac 21" i3 (mid 2010)
iPad 2
ATV 3
iphone 4s
3x APExpress (for music airplay, 1 also as repeater)
AirportExtreme generating WiFi
Samsung on WXP
Dell on Win7
3Mbit DSL on Speedport700 Router
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Transfering files from PC to Mac via ethernet cable

I have been unable to connect my Mac for file transfer. I followed the directions on the following sites:
http://docs.info.apple.com/article.html?artnum=304721
http://docs.info.apple.com/article.html?artnum=106471
I connected both computer via an ethernet cable and used the 'Connect to Server' option in the finder. It searches for a while and then gives me the following error:
The Finder cannot complete the operation because some of the data in "smb://5.173.180.164/SharedDocs" could not be read or written. (Error code -36).
The folder i specified is open for sharing and i've run the network wizard on the PC. I can't seem to figure out what's wrong.
I appreciate any help you can give.
Message was edited by: jaboc77

You can connect them via ethernet cable. It will work fine.
No special software needed on either side.
What is it you are trying to do? Share files? Printers? Internet?
This article from iFelix may offer some help to you:
http://www.ifelix.co.uk/tech/3020.html

Ethernet cable doesn't appear connected?

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