Here is my squid.conf file. I compiled squid 2.6PRE3 on Cygwin ssl enabled on Windows XP SP2. I copied all neccessary dll's into c:\windows\system32 then run the program in Windows. Also I tried run Squid within Cygwin, the same:Invalid request. The http is OK. http_port 127.0.0.1:80 vhost vport cache_peer zyzg.org.ru parent 80 0 originserver https_port 443 cert=/usr/squid/etc/cert.pem key=/usr/squid/etc/key.pem cache_peer breakevilaxis.org parent 80 0 originserver hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? cache deny QUERY acl apache rep_header Server ^Apache broken_vary_encoding allow apache access_log c:/squid/var/logs/access.log squid debug_options ALL,9 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 SSL_ports port 443 563 acl Safe_ports port 80 acl Safe_ports port 21 acl Safe_ports port 443 563 acl Safe_ports port 70 acl Safe_ports port 210 acl Safe_ports port 1025-65535 acl Safe_ports port 280 acl Safe_ports port 488 acl Safe_ports port 591 acl Safe_ports port 777 acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow all http_reply_access allow all icp_access allow all visible_hostname ddint.org coredump_dir c:/squid/var/cache