If you are using any Desktop or Mobile e-mail client to fetch your Gmail emails, sometimes you might see following error:
Receiving’ reported error (0x800CCC92) : ‘Your e-mail server rejected your login. Verify your user name and password for this account in Account Settings. The server responded: -ERR [AUTH] Web login required: https://support.google.com/mail/answer/78754’
(Note: This error message is from Microsoft Outlook. Other devices / clients also show similar error messages)
This error usually occurs when you change your device, location, Internet Service Provider or your Internet Service Provider change its IP range. Google keep record of your devices, location and Internet Service Provider. When you change any of them, Google may consider it as a suspicious activity.
Fixing this error is not very difficult. Open your favorite web browser and login at Gmail with your Username and Password. Google will tell you about blocked login attempt upon successful login. Click ‘Was it you?’ link.
Google will redirect you to Sign-in & security where you can mark your current device as yours.