Apache Reverse Proxy als Authentifizierungsproxy - Error 401

Define SRVROOT "c:\Apache24"
ServerRoot "${SRVROOT}"
Listen 8080

LoadModule actions_module modules/mod_actions.so
LoadModule alias_module modules/mod_alias.so
LoadModule allowmethods_module modules/mod_allowmethods.so
LoadModule asis_module modules/mod_asis.so
LoadModule auth_basic_module modules/mod_auth_basic.so
LoadModule authn_core_module modules/mod_authn_core.so
LoadModule authn_file_module modules/mod_authn_file.so
LoadModule authz_core_module modules/mod_authz_core.so
LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
LoadModule authz_host_module modules/mod_authz_host.so
LoadModule authz_user_module modules/mod_authz_user.so
LoadModule autoindex_module modules/mod_autoindex.so
LoadModule cgi_module modules/mod_cgi.so
LoadModule deflate_module modules/mod_deflate.so
LoadModule dir_module modules/mod_dir.so
LoadModule env_module modules/mod_env.so
LoadModule headers_module modules/mod_headers.so
LoadModule include_module modules/mod_include.so
LoadModule info_module modules/mod_info.so
LoadModule isapi_module modules/mod_isapi.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule mime_module modules/mod_mime.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_html_module modules/mod_proxy_html.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule rewrite_module modules/mod_rewrite.so
LoadModule setenvif_module modules/mod_setenvif.so
LoadModule socache_shmcb_module modules/mod_socache_shmcb.so
LoadModule ssl_module modules/mod_ssl.so
LoadModule status_module modules/mod_status.so
LoadModule xml2enc_module modules/mod_xml2enc.so
LoadFile   C:\Apache24\bin\libxml2.dll
LoadModule filter_module modules/mod_filter.so

<IfModule unixd_module>
User daemon
Group daemon

</IfModule>

ServerAdmin support@irgendwer.de

ServerName irgendeinserver

<Directory />


    AllowOverride none
    Require all denied


</Directory>
DocumentRoot "${SRVROOT}/htdocs"

#####
	#ProxyRequests off

	ProxyPreserveHost Off
        ProxyHTMLInterp On
        ProxyPass / http://localhost/
        ProxyPassReverse / http://localhost/
 
        ProxyHTMLURLMap http://localhost /
	ProxyBadHeader Ignore
		
	
        <location />
	
		AuthType Basic
 		AuthName "Bitte Passwort eingeben"
	       	AuthUserFile c:\tmp\pwd
        	AuthBasicProvider file
        	require valid-user
		
 		ProxyPassReverse /
                SetOutputFilter proxy-html
		 
                ProxyHTMLURLMap http://localhost/ /
                RequestHeader    unset  Accept-Encoding
	
        </location>
#####

<Directory "${SRVROOT}/htdocs">
    Options Indexes FollowSymLinks
    AllowOverride None
    Require all granted
</Directory>

<IfModule dir_module>
    DirectoryIndex index.html
</IfModule>

<Files ".ht*">
    Require all denied
</Files>

ErrorLog "logs/error.log"
LogLevel info

<IfModule log_config_module>
    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
    LogFormat "%h %l %u %t \"%r\" %>s %b" common

    <IfModule logio_module>
      LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
    </IfModule>
    CustomLog "logs/access.log" common
</IfModule>

<IfModule alias_module>
    ScriptAlias /cgi-bin/ "${SRVROOT}/cgi-bin/"
</IfModule>

<IfModule cgid_module>
</IfModule>

<Directory "${SRVROOT}/cgi-bin">
    AllowOverride None
    Options None
    Require all granted
</Directory>

<IfModule mime_module>
    TypesConfig conf/mime.types
    AddType application/x-compress .Z
    AddType application/x-gzip .gz .tgz
</IfModule>

<IfModule proxy_html_module>
Include conf/extra/httpd-proxy-html.conf
</IfModule>

<IfModule deflate_module>
Include conf/extra/httpd-deflate.conf
</IfModule>

<IfModule ssl_module>
#Include conf/extra/httpd-ssl.conf
Include conf/extra/httpd-ahssl.conf
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>
<IfModule http2_module>
    ProtocolsHonorOrder On
    Protocols h2 h2c http/1.1
</IfModule>