Can't connect to internet with Safari or apple apps?

Joseph Buoscio, wrote:

Issue started on Wednesday June 19th.

Thanks for your reply, Leroydouglas. I seem to only have the problem on my MacBook Pro - I can use Safari, and access everything on my I-Mac, I-Pad, and I-Phone no problem. I also have the same issue with my MacBook at my office. All my other systems work fine. I don't think this is a Wi-Fe connectivity issue.

What changed happened on June 19th ?

There is no stand alone Safari however to refresh these apps you can boot into Recovery and reinstall the macOS on top of your existing macOS in an effort to sort this anomaly.

How to reinstall macOS from macOS Recovery: https://support.apple.com/en-us/HT204904

Joseph Buoscio, wrote:

I am running a MacBook Pro (15 inch, 2017), with Mojave (10.14.5). Issue started on Wednesday June 19th. I get an error message when I open Safari that Safari can't find the server. I have Safari 12.1.1 (14607.2.6.1.1) installed. I also cannot connect to the App Store, or check to see if there are any software upgrades that I need. I get an error message that Software Undate can't connect to the Apple Software Update Server. I can access the internet through Firefox. I'm at a loss as to what I need to do to fix this issue. I appreciate any advice.

See troubleshooting — How to troubleshoot Wi-Fi connectivity - Apple Support

Joseph Buoscio, wrote:

I was able to re-install the OS on my lap top and all seems to be working fine. I guess there was a corrupted file in there somewhere. Thank you to both of you for taking the time to help me fix my issue.

Good computing Joseph Buoscio !

Does Safari connect, when you use in a different account? Does it connect, when you use in your account, but in Safe Mode?

Check the installed Safari extensions.