Admin Site being redirecting to warning this Multiple Choices page

I receive these pages when either I logout or click the Return to site link in admin. This happens in both of my site I have with PhpFusion

LOGOUT
Multiple Choices
The document name you requested (/index.php) could not be found on this server. However, we found documents with names similar to the one you requested.

Available documents:

/index.html?logout=yes (common basename)

Please consider informing the owner of the referring page about the broken link.
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RETURN TO SITE
Multiple Choices
The document name you requested (/index.php) could not be found on this server. However, we found documents with names similar to the one you requested.

Available documents:

/index.html (common basename)

Please consider informing the owner of the referring page about the broken link.