Ethernet Won't Connect after 10.5.6 Upgrade

After doing the upgrade to 10.5.6 on my MacBook Pro, the ethernet port no longer seems to work. The Network preferences panel claims that the cable for Ethernet is not plugged in when it certainly is and works just fine with other computers (Mac and PC). I know Airport works since that's how I'm connecting to write this.
Anyone else seen this problem? Anyone have a solution?

Have you tried rebooting your router?
There are two major parts to connecting to the Internet using Wi-Fi and DHCP:
1) Associating with the network
This is where you connect to your local network, typically by selecting your router's SSID and entering its password. This is the Wi-Fi equivalent of connecting your machine to a router using an Ethernet cable.
2) Obtaining an IP address (and other network parameters) via DHCP
This is where your machine asks your local DHCP server for an IP address and if one is available, your DHCP server should provide it (and other network parameters, such as the local netmask, the gateway address for your network, the addresses of your network's DNS servers, etc.)
When this step fails, computers fall back to what is called a self-assigned IP address. This address, 169.x.x.x, is an IP address systems use when an attempt to obtain an IP address via DHCP fails.
This is done so that two machines connected to each other without a DHCP server in place will still be able to communicate in an ad-hoc fashion, but they will not be able to connect to other networks (such as the Internet.)
The question of why DHCP fails is a rather complex one with a variety of possible causes - router issues, DHCP server issues, and so forth. For example, some cable modems are configured to only issue a single IP address - any device other than the first to ask will not be able to obtain one. Still more common is they can only assign a limited number of addresses - say five - a number quite easy to reach if say you have a DVR, a couple iPhones, a computer and a Wii or XBox in the house.
So the first things to do to try and resolve the issue are the easy ones, and rebooting your router is tops on that list.

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Just a little while this was working. I am using a school network so I have no control over the router, it's public.
I had to change my MAC address in order to connect and for a couple of months it's been working, even today. I don't know what changed in the settings, though.
Now it won't connect via ethernet and states "Self-assigned IP". When I change the MAC address I do it through Terminal, it has never messed with the Ethernet IP settings, even today. But when I changed the MAC address again the Ethernet changed to "Self-assigned IP" instead of "Connected".
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I'm changing it because I can't connect to the internet through the original mac address.
I'm changing it through terminal using a sudo code which makes the change temporary. It goes back to normal once it's rebooted.
What I'm telling you and what emphasized is that it's been working. I admit I didn't monitor the Ethernet setting before when it was working so I can't tell you what state it was at "Connected" or "Self-assigned IP". So I thought that changing the mac address wouldn't interfere with it. So now when I change the address it won't connect, unlike just an hour ago when it connected fine. So now it won't connect wither before or after I change my mac address.
You see when it is connected to the net, regardless of what the mac address is, it should open up to the school's registration page. That's why a mac address change shouldn't prevent me from seeing that page but now it is.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
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After using my iPod for a couple of weeks with no problems, all of a sudden, it does not connect when I plug it into the dock. It will charge, but the "Do not Disconnect" logo does not come on and iTunes won't recognize it.
I definitely have the newest software on the iPod. I even downloaded iTunes again, even though I already had the up to date version. I am using the iPod Video on Windows with the Universal Dock. This is my fourth iPod so I am not a total newby. I have tried all of the normal fixes.
I have tried three different connection cables with the same results. The kicker is that my iPod Nano connects and works perfectly sitting in its dock right next to the iPod Video.
If anyone has had this problem or has any ideas please let me know.
I have reset the iPod more times than I can count.
iPod updater does not recognize it. "Please plug in an iPod to update it" is all that I get from that.
I have connected the iPod directly to my PC using three different cables (all of which work fine with my Nano).
The iPod is showing as a USB Mass Storage Device in XP's device manager.
The iPod DOES charge while in the dock.
Thanks, Rick

Without knowing which iPod model, Operating Systems, USB or Firewire and other specifics everyone has, it's hard to isolate what exactly the problem may be. I don't think all of you are having the exact same problem, but maybe you are.
Richard, looks like you covered all the bases. Here are a few more things, if you haven't tried. If your Nano and Video are both connected, it could cause problems. I saw a post awhile ago about a guy who's problems went away when he only connected one iPod. Actually, it's best to disconnect all USB devices you can while trouble-shooting, especially if they are a USB storage device. You mentioned trying different cables, what about different USB ports? You mention that the "Do not Disconnet" logo does not appear, but the device manager sees a USB Mass Storage Device. I'm not sure if that's possible, that the Do Not Disconnect will not appear, but it is being recognized by the device manager. Is the device manager seeing a different Storage Device? ...or is that what's happening? Maybe it's time for Steven's option #4. Here's a few more ideas for everyone.
-Make sure the iPod is charged, charging for 4 hours will do it. Some USB ports are not high-powered ports and won't charge an iPod.
-Reset and Restore do different things. Reset mostly resets back to factory settings and calibrates the keys (don't touch any keys while it is calibrating), and you should not loose any data on the iPod. Resets are mostly done by holding down key combinations on the iPod and different iPods have different key combonations, make sure you are resetting for the iPod you have. If the iPod won't reset (comes up with Exclamation Folder, Frozen, etc...), mostly likely will have to be serviced.
-Uninstall iTunes, iPod. This means completely uninstalling. There are some folders that may have settings stored in them that are not removed when uninstalling iTunes. Remove them also; http://docs.info.apple.com/article.html?artnum=93698. Restart the computer between uninstalling and reinstalling, especially if using Windows.
-Update the iPod. Download the latest version of Updater for your Operating System, there is one for MAC and one for Windows. Updater is also where you will Restore your iPod; http://docs.info.apple.com/article.html?artnum=60944
-Restore will erase all the data on the iPod (have backups of the data, it can't be recovered from the iPod) and restore it's factory settings (disable disk mode, etc). Restore is done from the Updater program. Here is information on restoring; http://docs.info.apple.com/article.html?artnum=60983.
-Check the system requirements for your iPod model. Win XP (Home and Pro) usually needs Service Packs (SP) 1 and 2. Some iPods will work with only SP1, but it's best to have both. Win 2K requires SP 4.
-Try getting updates for your computer, especially if you are using PCI cards for USB or Firewire.
-Isolate the iPod. Disconnect other USB devices, especially if they are storage devices. Stop any programs that might be running in the background, disable virus software...3rd party software can interfere.
-Some Toshiba notebooks with the VIA chipset "will not work" with iPods. Hopefully you have access to another computer.
The following article might help. "iPod appears in Windows Explorer but does not appear in iTunes"; http://docs.info.apple.com/article.html?artnum=93716.
I'm interested in what everyone finds out. Good luck.

Mail won't connect after waking from sleep

5K display iMac running Yosemite 10.2.2: When I first boot my iMac mail works perfectly as does the rest of my internet connection. I am using Ethernet directly connected to the router, but the same thing will happen if I use the wifi connection. Router is directly connected to the cable modem.
If I put the iMac to sleep and come back the next morning: I will see new messages available in my gmail and other accounts that have loaded during the night. If I hit the "get new messages" button, sometimes it will get the initial group of messages (IMAP) and move them into the POP gmail account, but most of the time mail will just fail to make a connection. The connection doctor will tell me that I'm not connecting to the internet. However, if I go to Safari or any other internet app, I have no trouble connecting.
Then, somewhere between 30 minutes and 2 hours after waking the iMac it magically connects - until the next time I put the iMac to sleep. Quitting and restarting Mail makes no difference. I have already deleted Sophos and anything else that others seemed to suggest would cause a problem. I have no trouble seeing anything in the mbox messages stored on the iMac. I just can't send or receive mail until it comes back to life.
Suggestions are gratefully appreciated.

I don't yet have Q2007, waiting for first patch to show up, but I would look for a conflict with other programs or background processes, lack of RAM, or whether you migrated some PPC application or libraries.
I see that Quicken 2006 got an update Sept. 9th.
One of the fixes in the Q2006 R5 patch:
Stability improvements were made to prevent Quicken from quitting unexpectedly when launching with certain internal files corrupted.
I would reinstall Quicken.
Rosetta:
I know it runs PPC, but if someone didn't tell me that PPC apps run under Rosetta, I would not know it was there (it isn't a listed process, and you can't choose whether to use Rosetta or not, like choosing between Preview and Acrobat). Only because under Get Info: Kind: Application (PPC) - and you would have to know that equates to Rosetta.
So you're sure it is working fine in Rosetta... I read 10.4.8 is suppose to improve Rosetta...
The best way to improve Rosetta is to have 2GB RAM.
Mac Pro 2GHz 2GB WD Raptor/Caviar RE 320 Mac OS X (10.4.7) 2 x APC RS1500s

Ethernet slow to connect after waking from sleep

Since installing Lion (and updating to 10.7.1) on my 2008 24" iMac I have noticed that after waking from sleep the internet connection takes about 10 seconds to restore. I have reset the SMC and PRAM and performed a safe boot (in case this helped) but to no avail. The slow conenction can be observed if after waking from sleep the Network System Preference is clicked and the ethernet status "light" is red, changes briefly to amber and then green indcating a connection. The iMac is connected via an ethernet cable to a Linksys 802.11n 4 port wireless router.
I also have a 2010 13" MacBook Pro, with the same OS, and version, conencted in the same way to the same Linksys router and it does not exhibit this problem.
This slow internet connection access after waking from sleep is an annoyance and I'd appreciate any input on how to elimnate it.
Thanks to those wiser than I, who might read this note.

SOLUTION FOUND!
I've found a list of possible solutions here's the link:
http://osxdaily.com/2011/07/22/wifi-dropping-in-os-x-lion-fixes/
I solved my problem moving the Ethernet and WiFi adapters in the top of the list and Bluetooth at the end.
Move Wi-Fi to the top of the Service Order list – This is an old tip that simply prioritizes WiFi as the primary method that your Mac should connect to the internet, and it seems to help maintain connections

Ethernet Won't Connect after 10.5.6 Upgrade

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