SCRIPT_FILENAME /www/soldk/www.subnet.dk/tools/error/403/index.cgi
SCRIPT_NAME /tools/error/403/index.cgi
This looks like a script setup to show this page on any 403 error. Probably emails all the same info to the admin also.
REMOTE_ADDR xxxxxxxxxxxxxxxxx
REMOTE_PORT xxxxxxxxxxxxxxxxxxxx
Also sends your info to the admin, so he can check on who you are and keep an eye on you. If you get a 403, it means you are trying to access something you are not supposed to have access to.