Wifi Issues with Macbook Pro High Sierra 10.13.6

At work, it is possible you need to access a Proxy server to get through your companies firewall.

First, are you using the corporate network?

Does your company have a corporate firewall?

Do you have a Proxy set in

System Preferences -> Network -> WiFi interface on the left -> Advanced -> Proxies

If you need a Proxy when at work, but you also take the Mac home and of course do not need a proxy, then you may also want to know that you can setup multiple locations, each of which can have their own proxy or no proxy settings. System Preferences -> Network -> Location. By default location is "Automatic", but you can click on that and select the gear icon, then duplicate your existing location, give it a new name and then configure it with any location specify changes you need. Once you have multiple locations, you can use the Apple menu -> Locations to quickly change your network location.

Side note. The funny thing is the guy in the office across from me is also named Naresh, and just go his first company issued (and configured) 13" Macbook Pro.

Of course I know you are not my Naresh, as he has been a Mac user for years, and has used his own personal Mac at work. Besides our company issues 2017 13" Macbook Pros with ONLY 2 Thunderbold-3 USB-C ports. You are really lucky your company got the 4 port versions. We struggle trying to get the right combination of adapters that will allow us to drive 2 monitors, an Ethernet port, some USB3 ports and still provide power. 4 ports would make that so much easier.

The company I work for has recently started allowing employees to choose a company issued Mac or a Windows laptop, and the IT mindset is Windows, which means anti-virus whether macOS needs it or not.

The only good thing I can say about McAfee is that they offer the ability to escrow the FileVault key, which as it is a company laptop, not loosing access to the data on the Mac is important. The rest of McAfee is just a pain for the Mac users.

So you are not alone in having Windows-focused IT a department dictating how you should use your Mac.

I only have experience with 4 rather large companies. But they have all required you to specify a proxy server in order to access the internet.

In the later years, many of them have put some kind of net-nanny on the firewall to block access to websites they do not want you to access on the company network.

But I've always needed to specify a proxy server in the System Preferences -> Network -> Advanced -> Proxies tab

If the computer was configured by the IT Department, I would take it back to them to have them fix it. It is possible they put controls in place that are causing what you are seeing.

You are welcome.