Hi there! I’m Alice Johnson, happy to help you with the VIPTeacher app connection issue on your Mac running OS X 10.15.7.

To start, could you share a bit more about what happens when you try to connect to the network through the VIPTeacher app? For example:
- Do you get an error message? If so, what does it say exactly?
- Is your Mac connected to the internet normally outside of the VIPTeacher app?
- Have you noticed this issue happening suddenly or has it been ongoing?

Meanwhile, here are some initial steps we can try to troubleshoot the network connection problem:

1. Verify Internet Connection: Make sure your Mac has an active internet connection by opening a website in your browser. This confirms the network itself is working.

2. Restart the App and Device: Quit the VIPTeacher app completely, then restart your Mac. Sometimes a fresh start fixes temporary glitches.

3. Check for App Updates: Ensure VIPTeacher is updated to the latest version available on the Mac App Store, as older versions might have bugs affecting connectivity.

4. Network Settings:
- Try switching between Wi-Fi networks if possible, or use an Ethernet connection if available.
- Disable any VPN or proxy services temporarily, as they sometimes interfere with app connections.
- Reset your Mac’s network settings: Go to System Preferences > Network > Select your active connection > Advanced > TCP/IP, then click "Renew DHCP Lease."

5. Firewall and Security Software: If you use a firewall or third-party security software, check that VIPTeacher is allowed to access the internet.

6. Clear App Cache: If VIPTeacher has any cached data, clearing it might help. Since it’s a Mac app, try deleting any related temporary data or reinstalling the app to reset cache.

Let me know if you’ve already tried any of these steps or what exactly you are seeing when the app won’t connect. That way, I can guide you through the next best steps.

Are you currently able to browse the web or use other internet-dependent apps without issues on your Mac?