404 on form submission

[eluser]xLite[/eluser]
[quote author="dereklee" date="1274747131"]For me I had this weird scenario. My textarea would cause a 404 on the word from, if i removed the m and used any other letter it would submit ?? bizzare.[/quote]

That happens to me as well except it's when I type http:/. Very strange...

[eluser]dereklee[/eluser]
I am getting closer to sorting this. If you go into Codeignither.php everyhting loads up to this point

$RTR =& load_class('Router');

line 101

[eluser]dereklee[/eluser]
I haven't totally solved it yet, I believe this issue has to do with a bug related to the .htaccess rewrite. I drilled down into the Router.ph class and the URI is throwing a 500 error

[eluser]dereklee[/eluser]
I solved this. It's not a code issue with CI. It was caused by Mod Security throwing a 500.

ModSecurity: Access denied with code 500 (phase 2). Pattern match

Have your server admin whitelist the url that you are posting too

[eluser]xLite[/eluser]
So the url as in the process page? website.com/process or just website.com ?

Also, why does the error only happen occasionally and not 24/7?