10.7.3 Breaks Network Connectivity iMac?

No Little Snitch here.

Oh well - that would've been too easy! I'm just looking for reasons why both my Macbook Pro and my Mac Pro would have been affected in exactly the same way. Software installed on both seemed a logical answer, and there's a lot the same, but Little Ssnitch seems to be the only shared app that messes about with the network stack.

To confirm - it isn't limited to wireless; my Mac Pro is experiencing this problem on a wired connection.

With or without a fixed IP address, Internet traffic appears to be blocked. I do, however, seem to be able to connect to local IP addresses (in my case 192.168.1.x) - I haven't tried external addresses by IP address, but I will; even with a DNS server on the local network (ie. 192.168.1.1), addresses aren't being resolved.

It's not limited to wireless. I couldn't connect using an Ethernet cable, either, until I tried the firewall trick.

Prior to installing 10.7.3, I had the wi-fi problem waking from sleep, lots of connection timeouts,the inability to reliably connect to most public wi-fi's (such as at the library or coffee shops), and a really poor connection even when it did connect. All of which started when I upgraded from Snow Leopard to Lion. But if the moon was aligned just right and I waved a chicken over my head a few times and ate my veggies, I could occasionally get a wi-fi connection.

After installing 10.7.3, I couldn't connect at all using wired or wireless. For the record, this is not what I'd call an improvement. Yes, I can now use the firewall trick and get a connection, but it's a manual fix that needs to be repeated often. Not a true solution. And I haven't been out with my computer in the last 24 hours, so I don't yet know if I'll be able to connect anywhere else. We'll see about that tomorrow...

I found a fix for this issue, however it does take a little time, but at least you don't have to toggle the Firewall off and on everytime you restart. Boot to the Recovery HD by holding down Command-R during startup and then Reinstall Mac OS X. This installed 10.7.3 and now I don't have any issues with my network connectivity.

Command R still brings down 10.7.2 for me on Lion 😟

I have same issue re wifi connectivity. Before 10.7.3 I had no problem at all, now have to restart after every wake up from sleep mode. Frustrating in the extreme. I read in support community that downloading update again, client combo, would fix it. Successful install. No it didn't fix it

Where to now? Is there a fix on the way?.

For now just press the power button to bring the Mac out of sleep, that works fine, you dont have to restart your machine.

For those of you experiencing this issue, can you please check if you have the root-or-admin-or-authenticate-admin rule in /etc/authorization? It should look like this:

<key>root-or-admin-or-authenticate-admin</key>

<dict>

<key>class</key>

<string>rule</string>

<key>k-of-n</key>

<integer>1</integer>

<key>rule</key>

<array>

<string>is-root</string>

<string>is-admin</string>

<string>authenticate-admin-30</string>

</array>

</dict>

Yeah, that's what I saw on my broken system too. Adding that key to /etc/authorization (taken from a working system) works around the issue for me. I suggest you try that before nuking your system with a reinstall.

Hey folks,

I had the exact same problems and I managed to get it sorted out by:

1. Download and install the Client Combo update (http://support.apple.com/kb/DL1484).
2. Run the "Repair Disk Permissions" under "First Aid" in Disk Utility (located in Applications / Utilities) for my system drive.
3. Restart

I hope this can be of any help and fix our problems as well!

Oups,

I forgot. The Firewall (found in System Preferences / Security & Privacy) must be enabled as well then it works.

Cheers!

Sure enough... After installing the latest 10.7.3 update today, everything went SIDEWAYS! Absolutely bad timing because I had just started working on some DynDNS stuff. I spent about 3 hrs tweaking my ATT Uverse wondering what the **** was going on. Of course, I blame it on ATT and wouldn't have thought an Apple update would screw me like it did.

After Google'ing the 10.7.3 update I came across your post. Sure enough, changing my firewall "locked system preference" setting back to "on", fixed my problem in a heartbeat. What the ****, how does an update change a "locked system preference"!

Dammit... this blows... this is the same BS I used to deal with back in the Microsoft days! I used to always have a giddy positive feeling when Apple updates were available, always believing my computers were going to run much better. That's gone now... shattered! Updates won't be going on my boxes for at least a month from now on.

Sorry for ranting, I just hope others don't waste an entire afternoon like I did.

Sincerely,

Apple Confidence Shattered