asked on Failed attempts to login in Office 365 tenant
I am noticing in my Office 365 tenant that there are numerous "failed login attempts" on almost all the users in the company? Why does this typically happen and what should I do to protect the company? I'm wondering if its a bot trying to attempt a hack.
FYI, the main admin account is MFA so that is secure. Should I consider putting a limit on attempts to login? If so, how do I do that and will that prevent users from logging that currently have access?
FYI, the main admin account is MFA so that is secure. Should I consider putting a limit on attempts to login? If so, how do I do that and will that prevent users from logging that currently have access?
Microsoft OfficeMicrosoft 365Azure
Last Comment
Vasil Michev (MVP)
ASKER
How would I know what region is coming from
Browse to portal.azure.com > Azure Active Directory > Singn-in
Download reports and filter for Failure status and see the Source.
https://docs.microsoft.com/en-us/azure/active-directory/reports-monitoring/concept-sign-ins
Download reports and filter for Failure status and see the Source.
https://docs.microsoft.com/en-us/azure/active-directory/reports-monitoring/concept-sign-ins
Easy fix, use one of the several Windows ports of Fail2Ban, such as https://github.com/glasnt/wail2ban or any other.
Fail2Ban works adaptively, on automatic, with no human intervention.
Just setup a rule to scan a log, then for any IP generating 3x bad logins over an hour or day or whatever time you like, block the IP for a day.
Fail2Ban works adaptively, on automatic, with no human intervention.
Just setup a rule to scan a log, then for any IP generating 3x bad logins over an hour or day or whatever time you like, block the IP for a day.
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This happens when someone use password spray attack.