MacBook failing to reach Adobe servers

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

I would contact Adobe support to find out if you need to open specific ports for access.

I have seen internet providers strangely enough block VOIP ports on their modems and I had to get the right port to unblock it.

I would also check with them to see if their server responds to your current version of Creative Cloud or Adobe application. If not, unfortunately you might have to retrieve a licensing preference from a clone backup you made of that setup before.

Are you connecting the Mac over VPN?