Prioritize ethernet over wifi on Mac OS X

I use a Time Capsule with both of my Macs running 10.8.3. I'd like to get the most out of my bandwidth speed, so I ethernet cabled both Macs to the Time Capsule. However, there are some apps I use to connect between the Macs that require Wifi (like remote controlling the Mac Mini from the MacBook Pro), so I leave it turned on. Can anyone tell me if there's a way in Mac OS to give ethernet priority over wifi for connections for the operations that can use ethernet?

In the Network System prefs, Select Set Service Order from the Gear menu.
Drag the Ethernet service above the Wi-Fi service.
If ethernet has a connection, it will be used, If not, the next service down the list will take the internet connection, if available.

Similar Messages

Prioritize LAN over Wifi in Windows 7

Is there a similiar setting in Windows 7 that tells the PC to always use the LAN connection over WiFi when detected? Also, is there a away to push this setting out via Registry or GPO?
Minimize the number of simultaneous connections to the Internet or a Windows Domain
This policy restricts simultaneous connections to the Internet or Domain network. If there
is at least one active connection to the Internet, a new connection (automatic) to the Internet will not be made. This is the same for Domain network. Manual connection will not affected by this policy. If there are multiple simultaneous connections to the
Internet or Domain (i.e., plug-in Ethernet while already connected to WiFi), the less preferred connection (i.e., WiFi) will be disconnected after the OS detects that it is no longer actively being used (i.e., network traffic over the less preferred connection
drops below a certain threshold).
Path: Computer Configuration » Administrative Templates » Network » Windows Connection
Manager
Jason

Hi,
I haven't found this similiar policy in Windows 7, but we can change the order in this way
Open the Network and Sharing Center.
Click Change adapter settings.
Press <kbd>alt</kbd> to make the menus visible, select Advanced Settings... from the
Advanced menu.
Reorder the items in Connections so that you Local Area Connection is on top.
Or you can manually configure the Metric on each adapter, please refer to this link:
An explanation of the Automatic Metric feature for Internet Protocol routes
http://support.microsoft.com/kb/299540/en-us
If you want to change the order in all PCs in a domain, I suggest you write a logon script, then push it to all client via GPO, you can refer to this link
http://www.chrisleblanc.org/modify-network-card-bindings-script-command-line/
NOTE
This response contains a reference to a third party World
Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft does not control these sites and has not tested any software or information found
on these sites.
or this script form Technet website
Disable Auto Connect on Wireless Network Script
http://gallery.technet.microsoft.com/scriptcenter/Disable-Auto-Connect-on-59c83f1e
Yolanda Zhu
TechNet Community Support

Shared ethernet over wifi changes 'second machine' subnet

I have a Mac mini (MM) that I connect to the LAN via an access point. I also have a Linux laptop that I want to also share on the LAN. I've connected the laptop into the ethernet port on the MM and I can browse the net. The problem is that where the local subnet is 192.168.x.x the laptop has received an ip address of 192.168.2.x via DHCP.
Consequemntly, I cannot SSH into the laptop via my MM as the two machines now reside on different subnets. I had thought originally that when connecting to a MM, this would 'share' the ethernet port and would simply pass packets between the router and the 'second machine' thus using the MM as in 'bridge' mode.
Is there any reason why the second machine has now received an ip address on a different subnet?

You do need to turn on AFP sharing.. since SMB is not used by TM.. although I have to admit to some confusion..
What application are you using that is spitting out rsync errors?? That is not Time Machine. Are you trying to do this by rsync directly?
You clearly do not have sufficient permissions on the Mac Pro to whatever directory you have set.. make sure you do the rsync with su login.. and make sure on the pro you set full permissions to everyone.
"failed: Permission denied (13)", "*** Skipping everything below this failed directory ***", "failed: No such file or directory (2)", and "rsync error: some files could not be transferred (code 23) at /SourceCache/rsync/rsync-45/rsync/main.c(992) [sender=2.6.9]".
Have you tried Carbon Copy Cloner?? That might be worth it.
Much better than Time Machine for backup over the network.
It is rsync based.
time machine app used in the guide appears to be an older version pre OS X 10.10.3
Another excellent reason to avoid TM.. it is flakey as !heaven in Yosemite.

Trying to share ethernet over WiFi but connection options are greyed out?

Newby question: I have a Mac Mini 2GHz C2D running OS 10.5.5. I am connected to the internet using my cable modem. When I use the Sharing system preferences control to establish Internet Sharing the boxes with "Share your connection from" and the box with "To computers using" are greyed out.
I'm fairly certain that the wifi card is working because I can see my neighbors wifi network. Also, a friends ITouch can see my computer and it even asks for and validates the password I established, it just can't access the internet.
Any help or suggestions would be appreciated.
Thanks

Streamlines wrote:
I am running 10.5.5 so that's not the issue. Also the Internet Sharing has been unlocked the entire time. I tried locking and then unlocking unlocking it (had to enter my admin password) and it didn't change anything.
Still confused.
Could the issue be related to other network settings such as network name, location settings, order of the internet and WiFi on the network control panel, etc.?
As I noted earlier you are running an old version of Leopard, so what I have may not be the same as what you have.

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/

Can't wake Lion over wifi (or ethernet) using iPad and home sharing.

I've upgraded to Lion and everything's fine apart from one problem: using my iPad to access home shared iTunes content on my mac no longer works when my mac is asleep.
That's a change in behaviour from Snow Leopard; I used to be able to sleep my mac and then wake it over wifi using either my iPad or iPhone to access all of my home shared libraries. The mac screen used to light up for ten seconds and then go dark again, but it served me the files.
Lion seems to go into a deeper sleep which it can't be woken from. If I attempt to wake my mac from my iPad within about ten minutes of putting my mac to sleep then home sharing seems to work and lets me use the home share libraries, but if I leave it any longer than that then the mac seems to fall into a coma and can't be woken. The weird thing is that I still see a "shared library" folder on my iPad, but when I click on it nothing happens. I think my Time Capsule is listening for wifi access and issuing the magic packet to the mac, but the mac just ain't listening.
I'm using a Time Capsule in bridge mode from an ADSL modem and I've accepted a TC firmware update last week and I'm on lion 10.7.3. I've tried using Ethernet to connect the mac to the TC (and temporarily disabled the wifi connection) but that still doesn't work. Also, note I'm NOT suffering from the problem that 10.7.3 seems to be giving a few other people - my mac reconnects to my wifi just fine when I wake it up manually. For the record, This was an upgrade, so there's still a tick in "wake on network" in power settings and home sharing on iTunes is still configured the same as it was before.
Does anyone have any suggestions about how I can get home sharing to work when my Lion mac is asleep please?
Jon

Jonathan:
The reworked release of the Combo came available the 2-nd or 3-rd of Feb, if you downloaded 10.7.3 complete after that date it will be OK already, no need to instal the Combo. But you can see the exact number of 10.7.3 in System Information/ Software panel: it should be 11D50b.....
fzahn:
I understand, I have TC and Extreme also, no need to set anything. And indeed I understand that it may be important for (as it is for me),
BUT even if it worked after you replaced the kext, I advise strongly not to read in an old kext over a new one, that may give other issues (you observed one already: Airdrop)... I hope you backed up the Lion one... for example such "replacing" was done in one (lousy) tool called TrimEnabler (to install Trim on a non-Apple SSD in the SnowLeopard OS): it replaced the whole kext. I read that there is a new version for Lion that just replaces the text piece that regards the identification for the Apple SSD's.... I do not dare to use such methods.... I advise to read the kext and compare the two (SL and Lion) and perhaps find a way to just replace the one string that is different (be sure it is precisely the same lenth in caracters)... BTW: after every update of Lion you have to do it again probably. Keep searching for a better way to solve your problem.
Did you do the firmware update of the TC and Extreme already?
BTW: there are two Airport Utilities for Lion: Airport Utility 5.6 and Airport Utility 6, the 5.6 is the "old" visual but in the new one 6 you can not change as many settings; if you want them both, change the name of the one you already have by putting the version number at the end of its name in Utilities, and install the other one, it will be installed additional not over.
Lex

Apple TV doesn't recognize computer over WiFi, but does through Ethernet

Home Sharing from iTunes on my Mac Pro to an Apple TV (2nd Generation) only works if the Apple TV is connected to the router using Ethernet (i.e., hardwired). With WiFi (using the same router), the Apple TV won't detect the Mac Pro library. Everything else works fine over WiFi (e.g., Netflix and movie rentals). I can even control the Apple TV using my iPad when connected via WiFi or Ethernet. The only thing that doesn't work via WiFi is access to a network iTunes library. Any suggestions? The router is in bridge mode (i.e., it is an extension of the router that the Mac Pro is connected to). However, since the hardwire connection works, why wouldn't the WiFi connection work? And why does it work for everything but the network library.

Thanks for the suggestions. The problem actually solved itself. When I unplugged my Apple TV, the wireless wasn't recognized so I put it to sleep and woke it back up. When it came back on, the wireless recognized my Mac Pro library. If anyone else has trouble, you might try getting the Apple TV to recognize the desktop by using a hardwire. Then restart the Apple TV (or put it to sleep and wake it back up) with the ethernet unplugged and see if it will show up.
By the way, the bridge mode on my extender isn't a problem. I can hardwire or wireless to the extender router and the IP address on the Apple TV is the same as the host router (i.e., the one that the Apple TV is not plugged into).
Thanks again.
-Andrew

Mac Mini 2011 - Slow Transmit Rate Over Wifi

I just swapped over my 2009 mac mini for a new model, and the wifi performance was below average (I use it as a media centre streaming videos over the wifi network to my tv) The 2009 model would stream 1080p files with no problem at all - but the 2011 model couldnt handle it....
I called apple support (after formatting and re-installing lion, and trying every known "improving wifi performance" tactic'). They advised that it sounds like a hardware fault, so I took it back to my retailer, and got a brand new one...
The new one worked awesome! streaming 1080p files with ease...
Then today... its started glitching again, and when checking the stats of the wifi connection.. I have a tramsmit rate of 14..
Does this problem relate to a software issue with lion? What is happening?? I didnt change anything.. One day - Perfect... Next day - Bad...
Help!

It will help to analyse the problem if you do another test. Or a couple of tests.
First test for WAN speed issues.
Can you please do a test with ethernet plugged into the AE instead of the modem.
Wireless off and see if you get full speed as per the modem router.. or you are suffering the same slowdown.
If you clearly get the same speed here as you get via wireless, no need for the second test. The issue is not wireless at all, it is the WAN speed of the AE which can be problematic.
Second test for Wireless Speed issues.
Please do a file transfer in your local LAN to another device eg another computer plugged in by ethernet to one over wireless.. You do want just one wireless link.. so you are testing transfer speed over the wireless.. copy just one large file, like an OS update.. 1GB or so. You can open the activity monitor to track the progress.. you can even post a screenshot of the transfer graph which can be helpful.
So you have between the two tests checked the WAN and the Local LAN speeds. With this we can more easily figure out the bottle neck.
Please do use b for bits.. all network speeds are in bits .. B for Bytes.. which is file sizes etc. 8bits in a Byte.. but network speeds and file transfer speeds we need to be clear in using consistent terms.

Time capsule USB printer works when I connect via ethernet but not over wifi

I have a USB printer hooked up to my new Time Capsule. If I turn off my wifi and connect to the Time Capsule with an ethernet cable it works fine. When I try to do the same thing over wifi (even when I'm sitting next to it) it cant seem to make a solid connection. Most of the time it just says Printer Paused, but sometimes it will work, other times the printer just clicks, or starts but then stops. Other than that my wifi connection seeems pretty good.
Is there something with the settings with my older "08 MacBook and the newer Time Capsule?
Any help is very much appreciated,
Thanks

Very interesting one..
Did you upgrade install ML into the MB??
It sounds to me like it has corrupted the wireless drivers.. and I think you will need to do a clean install.
If you have internet working over wireless I see no reason for this to happen though.

How can I connect to another Mac using only Ethernet while Wifi is on?

Anyone has any ideas!
I have a MBP 2013 (Late) running Mavericks and I would like to connect to my other Mac (via a switch) through Thunderbolt Ethernet.
Basically I would like to connect only via ethernet to my other mac.
I would in the mean time like to leave my Wifi on the MBP so that i can access the internet etc..
So the problem is my mac (MBP) would jumpt to wifi to connect to my other Mac Pro (the mac pro has wifi on as well)
Any solutions?
Thanks!

No. What you want to do isn't possible.

My Time Machine backups are significantly larger, and slower, over WiFi than Ethernet

My regular hourly backups from my Time Capsule began acting up a month ago. They were abnormally large (25-100 MBs) and took a long time--once, six hours.
I connected my Time Capsule to my MacBook Air through ethernet to repair the disk through Disk Utility, (I turned Airport off on the Air, but not the Time Capsule), and then to rebuild the Spotlight index for the Time Capsule.
Backups over ethernet work just fine now. The backup will happen in two parts, of around 200 KB each, and take two or two and a half minutes. But when I turn Airport on the Air back on, reconnect to the WiFi network, unplug the ethernet cable, and immediately start a new backup over WiFi, the two parts balloon to around 20 MB each, and the backup takes hours.
This is a backup over ethernet, which took 2 minutes, 21 seconds:
Starting standard backup
Attempting to mount network destination using URL: afp://Martin%[email protected]/External%20HD
Mounted network destination using URL: afp://Martin%[email protected]/External%20HD
QUICKCHECK ONLY; FILESYSTEM CLEAN
Disk image /Volumes/External HD/Martin Fox’s MacBook Air.sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
No pre-backup thinning needed: 1.70 GB requested (including padding), 733.41 GB available
Copied 1082 files (104 KB) from volume Macintosh HD.
No pre-backup thinning needed: 1.70 GB requested (including padding), 733.41 GB available
Copied 429 files (153 bytes) from volume Macintosh HD.
Starting post-backup thinning
Deleted backup /Volumes/Time Machine Backups/Backups.backupdb/Martin Fox’s MacBook Air/2012-05-11-225349: 733.41 GB now available
Deleted backup /Volumes/Time Machine Backups/Backups.backupdb/Martin Fox’s MacBook Air/2012-05-11-200538: 733.41 GB now available
Post-back up thinning complete: 2 expired backups removed
Backup completed successfully.
Ejected Time Machine disk image.
Ejected Time Machine network volume.
This is the second backup after that one, done over WiFi. (The first was incompletely recorded by Time Machine Buddy, but took around half an hour.) It took 1 hour, 54 minutes, 50 seconds:
Starting standard backup
Attempting to mount network destination using URL: afp://Martin%[email protected]/External%20HD
Mounted network destination using URL: afp://Martin%[email protected]/External%20HD
QUICKCHECK ONLY; FILESYSTEM CLEAN
Disk image /Volumes/External HD/Martin Fox’s MacBook Air.sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
No pre-backup thinning needed: 100.0 MB requested (including padding), 733.41 GB available
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Copied 26 KB of 20.6 MB, 98 of 98 items
Copied 1485 files (22.0 MB) from volume Macintosh HD.
No pre-backup thinning needed: 1.72 GB requested (including padding), 733.41 GB available
Error: (-8084) SrcErr:YES Copying /Users/foxmarti/Library/Application Support/Firefox/Profiles/ehjqi949.default/places.sqlite-wal to (null)
Copied 1941 files (27.5 MB) from volume Macintosh HD.
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
Eject

slyfox1908 wrote:
I live in an apartment building so there are a number of WiFi networks around.
Not to mention cordless phones, microwaves, etc., any of which can interfere.
On iStumbler, my network shows up twice--once on channel 149, with signal strength of 50-65% and noise of 15%--and again on channel 10, with signal strength of that wildly varies from 20% to 90% and noise of 20%. Other networks in the building are on channels 1, 2, 6, and 11. The graph of channel 149 is very smooth, while the graph of channel 10 is choppy.
It's probably using 149, as those numbers are pretty good. Press Alt/Option before clicking the Airport icon in your menubar to see which band it's using.
Watch the band it's using while running a backup. Try other channels in the area of 149. Unfortunately, it's a bit of a "hit and miss" thing.
Why are there two networks? Is that part of the problem? My Time Capsule is located about three feet right and a foot below my desk, so I can't think of a reason why it wouldn't be 100% for both channels.
It's a dual-band router. As I understand it, OSX will pick the best signal.
I really want to know I have a clean, safe, accessible back-up before I replace it though. Right now I don't trust the Time Capsule.
Do at least your last backup via Ethernet.

TS4062 I'm trying to sync my ipad over wifi, with my MAC, I have the updated software on my MAC, the ipad is up to dat 6.1.2. I can follow all of the steps, but I can't find a SUMMARY button on the toolbar, nor do I receive the option to sync. Whats wro

I'm trying to sync my ipad over wifi, with my MAC, I have the updated software on my MAC, the ipad is up to dat 6.1.2. I can follow all of the steps, but I can't find a SUMMARY button on the toolbar, nor do I receive the option to sync. What am I doing wrong or what should I look for? Thank You

To sync your iPad over Wifi:
First ensure you're running iTunes 11.0.2. And you already have your iPad up to date, good.
Plug your iPad into the Mac via USB. Click your iPad in the top toolbar (under the search bar). Click the Summary tab if it isn't already selected. Check the box to "Sync with this iPad over Wi-Fi" (you may have to scroll down to see it). And now click the Apply button at the bottom right.
You should be able to unplug your iPad from the Mac and it should still remain in iTunes. (If not, try Quitting and relaunching iTunes and waiting, restarting iPad, etc).
To initiate a sync over Wifi, click your iPad in the toolbar in iTunes then click Sync. Or on your iPad, go to Settings > General > iTunes Wifi Sync and tap "Sync Now."
If this didn't solve your problem, please let me know with a more detailed explanation of what you're experiencing so I can try to help you get up and syncing wirelessly!

Mac will not sync with ipad over wifi

I have iTunes set to sync with the ipad over wifi; wifi is turned on on both mac and ipad; both are logged in but i can only sync using a cable plugged into the mac. Any ideas why.
Thanks for the help

Your MacBook must be quite old. My suggestion is to sell it and replace it with a newer model that can support later software. You have probably received many years of good service from the old machine.
Good luck.

Can I use wifi connected Mac Mini as an ethernet hub?

Hi!
I have my Mac Mini next to the TV. It gets the wireless internet connection from my apartment complex.
I also have a Blue-Ray player that is online capable, but not wireless. Can I get the Blue-Ray player online by running an Ethernet cable to the Mac Mini?

Yes, go into System Preferences and open the Sharing panel where you will see a check box for Internet Sharing and it's options.

I am trying to download iOS 5.1 on my iPhone and iPad. Both times it tries connecting to the software update server and just hangs there. I've tried doing both over wifi and get error message. What do I do?

I cannot download the ios 5.1. I'v tried doing it through itunes after downloading the latest itunes. It says that my phone and ipad both have new updates and tries to coonect to update software server. That is where it hangs up and just keeps trying to connect but never does. Then when I try to update my devices over wifi, it tries and thens gives me a download failed message after a few minutes. What do I do?

This has solved loads of people who have this issue and have used an alternate DNS setting. Below are instructions for both iPhone OTA and on you Mac
If you are getting the error message "Unable to check for update" when you try an OTA (over the air update)
Change DNS Servers
Settings -> Wi-Fi
Click the blue arrow on your connected network
Delete everything in DNS and replace it with 208.67.222.222, 208.67.220.220
Try again
If this works, you will probably want to remove the WiFi network using "Forget This Network" and then reconnect to it to get your original DNS servers back. Alternatively, make a note of the original DNS servers before deleting them and replace it after you are done.
If you are getting the error message "Unable to check for update" when you try through iTunes
On your Mac
Choose Apple menu > System Preferences, and then click Network.
Select the network connection service you want to use (such as Wi-Fi or Ethernet, unless you named it something else) from the list, and then click Advanced.
Click DNS, and then click Add at the bottom of the DNS Servers list. Enter the IPv4 address for the DNS server.
You can use OpenDNS
208.67.222.222
208.67.220.220
or
You can Google Public DNS if you want
8.8.8.8
8.8.4.4
I have actually repointed my routers DNS so all my devices now point to OpenDNS servers

Prioritize ethernet over wifi on Mac OS X

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