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Sign in error 50053 RRS feed

  • Question

  • big regards,

    I have 100 users in Office 365 Azure Active Directory

    Regularly, check every day sign in status.

    But, some users had Failure status 50053 Code.

    Very odd situation is sign in from IP address from Asia , example.

    Azure, blocked that sign in , from unknow IP address,

    But, what s happened?

    Is this virus on mobile phone, Laptop or PC?

    Thanks, regards from Bosnia and Herzegovina 


    Tuesday, May 21, 2019 4:33 AM

All replies

  • Hello, 

    50053 code generally indicates "Account is locked because the user tried to sign in too many times with an incorrect user ID or password."

    I understand that the attempts are coming from an Unknown IP address as well. This could be a brute force attack or someone is probably using a VPN to login anonymously. 

    I do not think it's a virus as it's affecting multiple users at the same time. I would suggest having MFA enabled for your users as a security measure and you could also consider deploying Identity Protection in Azure AD.

    Tuesday, May 21, 2019 5:13 AM
  • Let us know if the above reply was helpful and please remember to mark as answer to help others in the community who may be facing similar problems.
    Wednesday, May 29, 2019 9:32 PM