How do I fix error code 721?

Release and Renew your IP Configuration

1. Hit Windows key + R.
2. Type ‘cmd’ into the newly-opened ‘Run’ window.
3. Hit CTRL + SHIFT + ENTER to open the Command Prompt with admin privileges.
4. Input ‘ipconfig/release’ into the black window and hit ENTER.
5. Input ‘ipconfig/renew’ and hit ENTER once the ‘release’ command is finished.

1 Sept 2021