Getting the error “Disallowed Key Characters” ? This error was caused by developing locally on my machine (127.0.0.1) with xampp, i used the windows host file to re-direct halodev.snaver.net to my local web server for development. However when i switched to developing online, i removed the host file config for the domain and then upload my website to my server, this is when i got the error.
To fix i had to clear my cookies, i believe it was a cookie problem as i also changed my unique $config['encryption_key'] in the config file.
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This error drove me nuts for quite some time. Even your suggestion didn’t fix the problem. Here is what I did to find the issue.
In the core CI code in system/libraries is a file called input.php I made a small modification to that file so that it would show the actual data in question.
Around line number 199
function _clean_input_keys($str)
{
if ( ! preg_match(“/^[a-z0-9:_\/-]+$/i”, $str))
{
exit(‘Disallowed Key Characters: ‘.$str); // Added the variable to display.
}
return $str;
}
I certainly hope this helps others.