When trying to log in to AEM, the error "User name and password do not match" is returned in a red box on the login screen.
When inspecting the network traffic via a browser debugger, a 403 error response is returned from an Ajax HTTP POST request to this URL:
/libs/granite/core/content/login.html/j_security_check
The user name or password could be incorrect or there could be an error from the authentication handler during login.
If the issue only happens with one or a few users, then it could be that the wrong user names or passwords are being used or the users don't exist in AEM.
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Use Chrome browser and open Developer Tools => Network tab in the browser, then, attempt to log in again.
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Go to the user administration screen.
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If any errors or warnings are logged, then analyze those warnings. If nothing is logged, then enable a debug log with these settings:
Log Level: Debug
Log File: auth-debug.log
Loggers:
org.apache.sling.auth
com.adobe.granite.auth
com.day.crx.security.token
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At this point, if you are unable to analyze the log messages, and find the root cause, then contact AEM Customer Care.
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