Error_The resource cannot be displayed

[gChambers]

First thing __ installation and customization of SMF was just wonderful. Minor issues that were quickly resolved in this forum.

I now have another issue that may a similiar easy solution. Here's the setup:

I've got the forum linked from an explanatory home page -- large button to enter the forum. When the button is clicked very often (but not every time) an error screen appears which displays the following:

The resource cannot be displayed
The resource you are looking for cannot be opened by your browser.

HTTP Error 406 - Not acceptable
Internet Explorer 

If I hit "Refresh" -- index.php will always open. Obvioulsy, this is not good procedure as most visitors will assume the site is broken and will move on.

Does this look familiar to anyone? Obviously, a forum has to be rock solid to encourage participation. How can I banish this error screen?

[gChambers]

Does anyone have an idea on how I can solve my problem. COuld there be a corrupted file or perhaps some setting that I can modify in the admin area?

I have a forum linked from a button on a home page. When the button is clicked to enter the forum I get a 406 error. THis happens in both IE and Firefox. If I refresh the page the forum appears as expected. Please help as visitors to the site will think that the forum is non-functional.

Firefox display:

Not Acceptable
An appropriate representation of the requested resource /forum/index.php could not be found on this server.

[Ben_S]

Got a link to phpinfo?

What is phpinfo.php?