I have a "500 Internal Server Error" when the admin.cgi is called. The login.cgi is shown the error comes only after sending the login button.
According ErrorLog can be found libgd.so.2
admin.cgi: error while loading shared libraries: libgd.so.2: cannot open shared object file: No such file or directory, referer: http://vod-blog.com/cgi-bin/te/login.cgi
GD library for C is missing on your server. Remember, for C, not for some script language.
You will also notice that "image.cgi" is not working. You have to install gd-devel 2.0 for C programming language and it can be found/installed here:
FreeBSD: /usr/ports/graphics/gd/
Linux: yum install gd-devel