Cannot Connect to the Internet

Davy_jones Said:

"Cannot Connect to the Internet: "

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Troubleshooting Wi-Fi on a Mac:

A few thoughts to try...

I. Clear your Temporary Internet Files:

Boot into Safe Mode and then Clear your Temporary Internet Files of Safari:

1. Booting into Safe Mode: [hold down shift upon boot until the login screen appears]. See if this is still an issue. Safe Mode lets items run as default, without changes whatsoever. That is possible because caches of your macOS are temporarily disabled while in Safe Mode
2. Clearing your Temporary Internet Files (Cookies & Cache) of Safari: Cookies perform remembrance of certain site-entered data. Whereas Cache keeps a snapshot of the last time you visited a site.  Use this Link: Clearing History and Cache - Apple Communities

II. Restart your Router:

1. Power: off the router
2. Wait: 30 seconds
3. Power: It back on

III. Boot in Safe Mode:

[Hold Down: shift key, upon boot], In Safe Mode, Login Items do not run at login, certain preferences are set aside, and damaged system files are then reset. So, once booted in to Safe Mode, wait 30 seconds, and then boot up normally, attempting another update install.

IV. Try a New Admin User:

What happens when you create a new administrator user, and log into it? Do you still get this error? If not, then it is likely an error with the current user. If so, then it is likely an error with your Mac.

V. Reset your SMC and your NVRAM:

(Applies to Intel-Based Macs Only) Sometimes changes (i.e. Installations) are made to the system and then settings (i.e. Networking) become corrupted, technically. So, reset both on your Mac. So, reset the SMC and reset the NVRAM or PRAM. It might take three tries. to fix this. So, be certain you have the time to do so.

Start With This:

• Reset NVRAM or PRAM on your Mac - Apple Support
• How to Reset the SMC of your Mac - Apple Support

Davy_jones Said:

"Cannot Connect to the Internet: I have a Macbook pro. There are two admin accounts in this Macbook, I started mine recently. When I try to connect to my university internet using my admin account it does not connect. But when I do it from the first main admin account there's no problem. [...]its just the university network.)"

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Troubleshooting a School Logins:

Speak with the Web Master of you school's network, as they are the ones who troubleshoot the devices syncing to the network.

"cannot connect to the Internet" is too vague to help you debug.

How are you trying to connect ? {Wi-Fi, built-in Ethernet, Ethernet with dongle, ThunderBolt, FireWire, other}

What specific error messages are you seeing, and where are you seeing them?

Using a new, different account is a classic debugging technique that allows you to leave the settings and added software in one account behind and start over.

In this case, the the troubled account is not new. There may be something you have added to that account that is interfering with connection.

Davy_jones Said:

"Cannot Connect to the Internet: I did with one of their IT staff. They say there’s something wrong with the Mac"

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Remove the network, and then try again.