Internet connection not working after computer wakes up from sleep. OSX Lion

I'm having similar issue since installing Lion on my iMac. After waking it from sleep, no WiFi connection. Connection is restored by turning off WiFi, then turning it back on. Connection is also restored by Rebooting or restarting iMac, or by unplugging router briefly.

No such problems with Mac Book Pro. They absolutely should have caught this issue with Beta testing. Wait til David Pouge hears about this.

I have the same issue on my MacBook. My kids are growing weary of having to turn airport on/off, however, the flip side is that they are learning to diagnose and resolve connection issues. :)

I imagine we'll all be receiving an update very soon from Apple.

Same here with an iMac mid 2007. My connection is wired.

So it has nothing to do with airport-stuff.

It REALLY is annoying as ****. How can something like this

happen? I mean, bugs yes. Version 1, no problem. But a bug

like this is kind of stupid.

I am having the same problem with a MacPro. I just set the machine to never go to sleep while I wait for a fix.

I have the the issue, but I don't think the connection is really lost, If I go to the terminal and ping google.com I get a reply (ping google.com), but Safari and the other applications from apple that connect to the Internet are not working (Microsoft messenger works fine :s), if I use the network diagnostics the issue will fix, but the quick fix is to close safari and open it again. It's working for me this way, no need to reboot the machine or the router, I know it is a pain but is the best I have so far.

I have an issue on my mac pro.

When it wakes from sleep, the (wired) connection takes 10 or more seconds to come up.

Firefox, and World of Warcraft launcher are both affected.

I dont have to do anything to fix it - just wait.

It was perfectly ok on snow leopard...

Ok, regarding the "Wake to sleep = No internet connection" problem under OSX Lion I discovered a few things.

- Whenever my mac puts itself to sleep the problem seems not to occur.

- Removing my WD 2 TB external harddisk, using for time machine backups, solves the problem instantly.

- Instead of disabling wifi and enabling it again, selecting "make Time machine backup now" ( Time machine icon,

upperright under startup items) also enables Internet again.

So, like some others also concluded, it seems to be Time Machine related ????

Same problem with my MacPro. I've not fund out when this happens (self sleep or forced sleep by user). This behaviour doesn't affect my network connection, this is working well, only internet is not working. My router is an AirportExtreme.

Currently I can repair this with the following steps:

I am using DHCP with static ip adress

Put this to dhcp only

renew lease

put back to DHCP with static adress

Then internet is working again.

Currently I am not using TimeMachine, so problem can not come from this.

I have a MacBook Pro and am experiencing the same problem. Obviously a glitch in the software. Hopefully they will push a fix soon!

Several have posted that their MacBook Pros won't connect to Internet after Sleep. Mine connects fine after Sleep. It's a recent purchase (2GHz Intel Core i7). On the other hand, my iMac (2.4GHz Intel Core 2 Duo) which is 4 years old, will not connect after Sleep. Some MBP's will connect after sleep, some don't. Assuming the same OS X Lion in all cases, then why don't some machines connect? Older processors? Other ideas?

After looking through this thread I thought I would provide more information...

I have the problem on a Mac Pro with wired gigabit ethernet. Wifi is switched off.

The machine is a mac pro early 2009 with 2 x 2.26 cpus and 16gb ram.

There are no external disks, but Time Machine is set to use a 2tb WD20EARS disk in slot 4.

Slots 1, 2 & 3 each contain a 1tb SAMSUNG HD103SJ disk.

When waking from sleep, firefox will not load any pages, but from a terminal I can ping internet addresses, and nslookup works, other applications are affected.

I have found that going into system preferences, networking will get it working again.

After someone's suggestion, this morning I went to time machine in the menu bar, and told it to start backup now - and that did bring back full networking.

I have the same issue with Lion at wake 😟, I have wired gigabit network, and when I wake my 27" iMac from sleep there is no network. I manually have to toggle wifi on and off to get my wired network connection work.

I have timemachine running on an external harddisk, but unmount this disk prior to sleeping.

Apple please fix this asap. 😮

Thanks

I had this problem on SL and on Lion as well, and it occures for WiFi and Ethernet connections.

In fact the internet connection was not broken as I could ping the destination usin the IP (not DNS name).

In this case the problem was related to mDNSResponder task which handles all dns queries.

It was the most frequent problem in my day to day work with SL and now Lion. It was never fixed by any patch from Apple. I tried almost all voodoo including fresh install, all possible config changes - no solution.

The only version with no problems related to network was 10.5.8. All the other versions had issues of different kind (WiFi instability (lost signal), DNS problems (for wireless and wired connection) sometimes associated with machine sleep and wake up and sometimes with no reason.

QUESTION: Is your problem independent of the access point / router you connect to.

I must say networking was (and still is) the weakest part, besides the other OS X weaknesses I experienced during 4 years of OS X usage.

No problems in the same network with Linux or Windows beeing ran natively on my iMac 🙂 So hardware is OK.

Software is of poor quality. Not much more to say in this matter.

I found a very interesting article dated 1996 about programming which I think is still valid.

Link to the article: http://www.fastcompany.com/magazine/06/writestuff.html

Below the fragment (with some connection to Apple)

Software is everything. It also s***s.

"It's like pre-Sumerian civilization," says Brad Cox, who wrote the software for Steve Jobs NeXT computer and is a professor at George Mason University. "The way we build software is in the hunter-gatherer stage."

Same issue here macbook pro. Super annoying fastest way to fix is to run nework diagnostic but an issue if your in class and you walk back to the computer to address next section only to have to restart wifi every time.