Hi, it is my first installation from a proxy server. I have a problem with the authentication from the client. It does not work. This are my test environment: OS: Windows 2000 Squid version 2.5 Configuration the squid.conf: http_port 3128 htcp_port 4827 auth_param basic program /squid/libexec/ncsa_auth.exe /squid/etc/passwd auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl our_network src 172.27.0.0/16 acl SSL_ports port 443 563 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT acl friends ident user our_network clemens service administrator ncsa_user acl clemo proxy_auth REQUIRED http_access deny !Safe_ports http_access allow friends our_network http_access deny friends http_access allow clemo our_network http_access deny clemo http_access allow manager localhost http_access deny manager icp_access allow all cache_mgr cwohlfart@xxxxxxxxxxx visible_hostname X06261AP used format encode for the user/passwd: Base64 The user und password is encode in the file passwd with the format MD05 I had installed the program Filemon (www.sysinternals.com) one the proxy PC. This program check the access to the files from the applications. I started the squid proxy server. If the client tried to connect the proxy server, the application squid or the second application ncsa_Fauth.exe did not have an access to the file passwd. I started the application ncsa=5Fauth.exe separate after that. If the client tried to connect the proxy server, the application ncsa=5Fauth.exe=20 open, read and close the file passwd. But the authentication failed from the client. Question: What is here wrong? Is the format of the passwd MD05? Why must I started the application ncsa_Fauth.exe separat too? Best regards Clemens Wohlfart