If you've recently made any changes to the CNAME record for your school, you might need to clear your DNS cache to ensure your browser properly recognizes your custom domain.
In this article, we will go through the necessary steps for Windows and Mac OS X.
For Windows (10.8 & 8.1)
1. Navigate to the desktop. (From Home, tap or click the Desktop tile).
2. Right-click the Start button (the Windows logo in the lower-left).
3. Choose Command Prompt (Admin).
4. When asked whether to allow Command Prompt to make changes to your computer, select Yes.
5. Type "ipconfig /flushdns" and press Enter.
6. Type "ipconfig /registerdns" and press Enter.
7. Type "ipconfig /release" and press Enter.
8. Type "ipconfig /renew" and press Enter.
9. Type "netsh winsock reset" and press Enter.
10. Restart the computer.
For Mac OS X
1. Close all browser windows.
2. Click Applications → Utilities → Terminal.
3. In the Terminal window, type in the corresponding command mentioned below for your Mac OS X version.
4. Enter the Mac’s password, if prompted.
5. Press the enter key and the DNS cache should be flushed.
- macOS Big Sur (11.0.1): sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
- macOS El Capitan (10.11), Sierra (10.12), High Sierra (10.13), and Mojave (10.14): sudo killall -HUP mDNSResponder
- macOS Yosemite (10.10): sudo discoveryutil udnsflushcaches
- macOS Mavericks (10.9), Mountain Lion, and Lion (10.7 up to 10.9) : sudo killall -HUP mDNSResponder
- OS X 10.6 and older: sudo dscacheutil -flushcache
For previous versions of Windows or more information about this process, check out this article, and in the case of Mac OS, you can find useful information here.