Access to / is forbidden

I have kinda- already solved my problem but I am posting this in case anybody has the same issue or has a better solution.

I have a hosted website account, but they let me use addon domains. The addon domain sits in a sub-directory of my main domains public_html folder, and the url for the addon domain is pointed there.
I decided to add Drupal to the first domain I registered, upon installation it modified the .htaccess file and made it to where if someone typed in my addon domains url they got an error page stating they didnt have access to "/"

maindomain.com <--- Drupal installation
folder: public_html/

addondomain.com <--- addon domain with root in maindomains public_html folder
public_html/addondomain/index.html

http://www.maindomain.com <--- takes me to Drupal

http://www.addondomain.com <--- returns Error
http://www.addondomain.com/index.html <--- displays website correctly

To work around this problem i used my cpanel and went to domain forwarding.
There I set a rule that www.addondomain.com would be forwarded to www.addondomain.com/index.html
therefore bypassing the "/" issue.

Even my webhost (i wont mention who i use) could not figure out why or how to fix the problem. Their solution was to delete the .htaccess file after drupal installation but I found that that solution renders Drupal unusable.

I hope that this may help somebody else who has the same problem, and if you have a better fix please let me know!