Network problems after installing Lion on one of three computers

This seems to be working for me:

Open System Preferences -> Network

Click the little gear drop down and choose Set Service Order

Make Wi-Fi be the top

Click Bluetooth PAN and then choose Make Service Inactive in the gear drop down button

Of course if you need to use Bluetooth you can try leaving that on. Maybe it's just having Wi-Fi be the top of the service order.

I do have the same problem indeed, and noticed some interesting details.

In my home I used to share a PPPoE/Ethernet connection through my iMac. It puts my Macbook, iPhone and my gf's PC online.

After upgrading to Lion however, it puts none of them online.

If I change the "Share your connection from" option to one of my VPNs, I can get online with my Macbook, but not my iPhone or my gf's PC.

Apart from that, it doesn't work no matter how many times I change password, channel, or other options.

Hope Apple comes up with a solution before next working week starts!

MacBook Pro and Imac 27 ... Both updated with Lion.... Same network settings. I can connect from the Macbook to the Imac, but NOT from the Imac to the Macbook. No way... Can't fix it with restarting, Turning on / off document sharing or creating a new account... Nothing. It was working perfectly with Leopard before... Seems a Bug to me...

I found a solution that worked for me. Seems like my firewall did not accept the afp connection permissions anymore after installing lion... Since everything worked well turning off the firewall.

So if you don't want to keep your firewall disactivated here is what worked for me:

- Leave your firewall activated.

- Turn OFF afp file sharing in the sistem prefs

- Restart your Machine

- Turn ON afp file sharing

- You should now get a message if you want to accept afp connections...

- click YES

Seems like this resets somehow the afp permissions in the firewall settings

Everything fine on my network now.

May be logging out and in again will sufice.

Probably noneed to restart.

I had similar problems. After installing Lion on 2 iMacs and 2 MBP, I couldn't screen share or file share between any of them.

What worked for me was deleting the user account and recreating it. Several important steps though:

1. Back up your system first

2. Write down your Full Name and Account Name (home folder name)

3. Creat a Test Account with Admin priviledges

4. Log out of Problem Account

5. Log in to Test Account

6. Go to Systems Prefs > Users & Groups

7. Delete Problem Account, but select "DON'T CHANGE HOME FOLDER"

8. Open FInder window > Users > and change "problem (deleted)" home folder name to "problem" (problem=your home folder)

9. Go to Systems Prefs > Users & Groups

10. Create new admin account with same Full Name and Account Name as before, then select "create user"

11. Select "use existing folder"

12. Log out of Test Account and log back in to your Primary account

13. Under "file sharing" I have no shared folders.

14. Under "screen sharing" I have allow access for Administrators

Everything works great again...

I had both of these problems and they are now fixed! Have 4 macs at home. 2 would not screen or file share. Both had home folders listed to be shared and both had user accounts without passwords set.

Make sure all user accounts have passwords. Screen Sharing won't work otherwise.

Make sure no user account Home folders are set up for file sharing. If they are, you must turn on SMB and turn off AFP sharing. Otherwise, just stop sharing the Home folders and you can use AFP too. Hope this helps!

Also install the ARD 3.5.1 update just in case.

After 3 days I finally have the functionality I had with 10.6.8

easy with that... That happened to me, my solution: reboot my modem and router. The problem was totally solved.

And what if - god forbid - my gf has a PC that also needs internet sharing from my iMac?

Apple really need to do something about this or offer a refund until the problem is solved..

I never had my home folders shared... But nevertheless file sharing was not working until I did a complete network settings reset + restart as written above.

Maybe you should take a look here: https://discussions.apple.com/thread/3195891?start=0&tstart=0

I experienced this problem as well, except between (as others subsequently in the thread experienced) two Lion machines.

Rebooting did not help, nor did turning file sharing off and on.

What did work was changing my file sharing settings to SMB. I had previously been the "Share files and folders using AFP" option. Instead, I disabled the AFP checkbox, clicked to enable the SMB checkbox, and then enabled SMB for each user account that I wanted to share.

That fixed it. Unelss you have some specific need for AFP, this is probably much easier than deleting and recreating entire home directories.

I have three Macs which I upgraded to Lion. Mac Pro, Mac Book Pro, and Mac Mini.

Mac Book Pro and Mac Pro worked fine, it was the Mini that was having issues, I could authenticate. I tried most stuff and it didn't work until I removed the Home folder from the shared folders list. You can still get to it when you authenticate the user. It connected immediately after doing that change.

So if you are having problems, remove all your shared folders, then add them back, don't put the home folder in the shared list.

Cheers