LDAP search Operations error

Situation

Ich hab heute bei meinem FTP Server folgenden Fehler erhalten:
2017-02-20 00:00:00,492 mod_ldap/2.9.4[9136]: LDAP search use DN \'DC=4b42,DC=com\', filter \'(&(userPrincipalName=noreply@4b42.com))\' failed: Operations error

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