El Capitan upgrade - cannot network between computers via wifi now.

Question

Level 1

12 points

El Capitan upgrade - cannot network between computers via wifi now.

Since upgrading my two MacBooks (Air and Pro) and Mac Pro (old tower style) systems to El Capitan, I cannot connect my laptops to my Mac Pro. Months have gone by with all attempted solutions (via web research) failed.

My MacBooks cannot see ANYTHING else on the network.

From either of my MacBooks, via wifi:

• I cannot print to printers.

• I cannot see other MacBooks.

• I cannot see my Mac Pro tower (it is connected to the network via wired connection, which connects to my Airport Extreme)

• I cannot see my Mac Mini (connects to network via wired connection, STILL CONNECTS to the Mac Pro (also wired connection only), runs on 10.7.5 b/c it's too old to update)

From my Mac Pro and Mac Mini:

• I cannot see either Macbook

• Mac Mini and Mac Pro CAN see each other

The internet works fine via all computers.

BUT, the Mac Pro tower has unsolvable problems with Keychain, and cannot connect to email accounts, or does so sporadically with some success. The Keychain issue has also absorbed hours of my life, and is also without a solution. Perhaps it is a related issue, I do not know.

Can anyone please help? I am taking great pains in restraining all forms of venting/ranting for the sake of productivity, but I am truly at wits end. Thanks in advance for help solving this...

MACBOOK PRO (RETINA, 15-INCH, LATE 2013), OS X Mavericks (10.9), 2.6 GHz/16 GB/1 TB

Posted on Feb 1, 2016 8:42 PM

Reply

Answer 1

brenden dv

Community Specialist

Feb 3, 2016 7:23 AM in response to Sarge_

Hi Sarge_,

Thanks for using the Apple Support Communities. I'm sorry to hear you have been having such extensive issues with your network after an upgrade to El Capitan; I know how frustrating that can be. I apologize if you have already tried this, but you may want to see if you can even get a baseline TCP/IP connection between your computers when they are connected to your network, as detailed below. If possible, you may also want to test them on a new network/different router, and/or on the Airport Extreme in factory default (unconfigured) condition:

When troubleshooting a connection issue, you can ping the IP address of the other computer using Network Utility. A successful ping verifies a TCP/IP connection between the two computers. This is an important first troubleshooting step when there's no response or a timeout for a connection attempt, since SMB connections involving a Mac require TCP/IP. However, a successful ping does not mean the SMB service is also available or working from the other computer.

How to connect with File Sharing on your Mac - Apple Support

OS X: About Network Utility - Apple Support

Resetting an AirPort base station FAQ - Apple Support

Regards

Reply