Install apt install ldap-utils Basic request (works unauthenticated, -L = dont print LDIF version, -s scope of search) ldapsearch -LLL -x -H ldap://<domainController> -b '' -s base '(objectclass=*)' Get information about single user (-b searchbase) ldapsearch -H ldap://<domainController> -D "<user>@<domain>" -w '<password>' -b "dc=<domainComponent>,dc=<domainComponent>,dc=<domainComponent>" "(sAMAccountName=<user>)" Filter "(objectclass=computer)" "DNSHostName" "OperatingSystem" "(objectclass=user)" "(&(<condition1>)(<condition2>))" Reference error troubleshooting RefErr: DSID-0310079C -> wrong DN/searchbase (incorrect domain controller or incorrect searchbase) Certificate error troubleshooting LDAPTLS_REQCERT=never