Help with .htaccess file

Hello I need help with my htaccess file. My hosting provider has given me access to it via ftp because I requested that I have a custom error page for bad urls: The content of the file was originally:

-------------BEGIN CONTENT
# -FrontPage-

IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*

<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName 1075813.1115303
AuthUserFile /data/10/1/75/161/1075813/user/1115303/htdocs/_vti_pvt/service.pwd
AuthGroupFile /data/10/1/75/161/1075813/user/1115303/htdocs/_vti_pvt/service.grp

Options -Indexes
-------------------END OF CONTENT

Then I added the line:
ErrorDocument 404 /notfound.asp

..to the file and reuploaded it. But when I type in a bad url for my site, it still doesn't work. Am I doing something wrong? The permissions on the .htaccess file is 744, are those right?

Thanks in advance for your help.

 

What happens when you put the full url?

Like

 

Same thing. Doesn't work.