<textarea> causing 404 error on particular inputs - html

Question

I've come across a weird problem. I have a simple form which submits data to a php processor page. However, the following input to the description field causes a 404 Error.
To recognize and reward the best in
Indian theatre, The Mahindra and
Mahindra presents META (Mahindra
Excellence in Theatre Awards). The
only award of its kind, META is
designed to showcase the best in
theatre being produced in India. An
eminent selection committee shortlists
the 10 best plays from innumerable
entries from all across India. These
plays are staged and adjudged under 13
award categories. The festival
culminates with an scintillating
awards ceremnony. Entering its sixth
year, META’s objective remains to
encourage all aspects of theatre craft
such as playwriting, set, costume and
light design, direction and
performance and promoting theatre.
I've tried changing the apostrophes and commas, even the brackets, but it didn't help.
The code for the form:
<form class="cms" action="add.php" enctype="multipart/form-data" method="post">
<table>
<tr>
<td class="text">
Title
</td>
<td class="input">
<input type="text" size="20" name="title" value="" />
</td>
</tr>
<tr>
<td class="text">
Date
</td>
<td class="input">
<input type="text" size="20" name="date" value="" />
</td>
</tr>
<tr>
<td class="text">
Image
</td>
<td class="input">
<input type="file" name="image" />
</td>
</tr>
<tr>
<td class="text">
Description
</td>
<td class="input">
<textarea name="description" rows="5" cols="20"></textarea>
</td>
</tr>
<tr>
<td class="text">
Link
</td>
<td class="input">
<input type="text" size="20" name="link" value="" />
</td>
</tr>
<tr>
<td class="text">
<input type="submit" value="Add / Save" />
</td>
<td>
<input type="reset" value="Clear" />
</td class="input">
</tr>
</table>
</form>
On submitting the text above i get the following error :
Not Found The requested URL
/cms/events/add.php was not found on
this server.
Apache/1.3.41 Server at
www.xyzs.in Port 80
Is this a problem with the text-encoding?

Answer 1

Could the add.php page contain an execute, maybe for an error page if the input is to long and the 404 is because the error page is not there?
I have seen similar errors in ASP where execute "" was used to load another page and if that page was not found you got an error, but exactly which error can differ from server implementation.
Also, does this work with other input with shorter or same length?

Answer 2

For someone else with Similar Issue:
Your text contains sensitive keywords which cause 404. Last night I got similar issue with text area, After deep analyzing I found that my text contains a keyword "Select", When I remove it submits successfully. In your case keyword "META" might causing this error.
What you have to do is white list these sensitive keywords from your server by contacting your server administrator.