kb: technical
Symptoms
- Plesk is not login to Plesk UI:
PLESK_ERROR: TypeError: Cannot read properties of undefined (reading 'toLowerCase')
- Log from
/var/log/plesk/panel.logshows:CONFIG_TEXT: [Action Log] Failed login attempt with login '<invalid>' from IP 203.0.113.2
Cause
The issue is caused by the Kaspersky Antivirus program installed on the PC used to login to Plesk. The request is intercepted by the antivirus program before being sent, which causes an error.
Resolution
Add Plesk URL in the exception list of the Antivirus.
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