Invalid username or password, please try again later

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Hi,We have a problem that we can’t log in to OWA and the mobile app a few times a day, but the error always goes away after a few minutes. We have Exchange 2019 CU7 and Windows Server 2019 servers.You receive the following error message:Invalid username or password, please try again laterDuring this time, the installed outlook works fine.The error started about 1 month ago.My question would be, where could the error be? In which log should we search?(IIS log, AD log,? Log)

schnittlauch · Answer

Hi Icsab ,I can't help you, but I want to inform you, that you should Update your Exchange ASAP to CU 9!I recommend the links listed down below.Best regardsSchnittlauch&nbsp;https://techcommunity.microsoft.com/t5/exchange-team-blog/released-april-2021-exchange-server-security-updates/ba-p/2254617https://exupdatestepbystep.azurewebsites.net/https://blog.qualys.com/vulnerabilities-research/2021/03/03/microsoft-exchange-server-zero-days-automatically-discover-prioritize-and-remediate-using-qualys-vmdr&nbsp;

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