I have an imac (intel) running 10.8.5.

Question

after upgrading to 10.8.5, a few months ago, I've noticed that after the imac goes into sleepmode (screen saver), the network connection is slow to reconnect or restablish to the internet. most times I have to close safari or firefox and restart the browser. sometimes it responds properly with my home page and sometimes I get the grayed out no connectivity message and asks to run network diags. eventuall the home page appears after several minutes. I also notied that on my verizon dsl modem the imac connectivity link led is not lit. after I awaken the imac by hitting the space bar, the led reappears on the dsl modem. but connectivity is still slow to restablish the connection.
I never had this problem until the upgrade to 10.8.5. I also have a windows based pc on the same dsl model (both are hardwired) and it does not have this issue. any ideas as to what may be happening? it seems like the dhcp address may be dropping and not restablishing properly. I have had this dsl service for more than 10 years and it's been solid.  Thanks to anyone with any comments or suggestions.
marsello1946

Answer 1

Test after taking each of the following steps. Back up all data before making any changes.
1. Make sure the network is on the preferred list by following these instructions. It's important to read the article carefully, as it's the starting point for any further efforts to solve the problem. If you skip any of the steps, the problem may not be solved.
2. Follow the instructions in this support article under the heading "Symptom: The network connection drops unexpectedly."
3. Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
4. From the Location menu at the top of the Network preference pane, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.
5. Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
6. In some cases, the problem has been resolved by repairing permissions on the startup volume.
7. Reinstall OS X.