Here you can find most ofter errors and problems can occure while upload via JavaPowUpload. Some articles join in groups relayted to technology of file processing code at server side.
<section name="requestFiltering" overrideModeDefault="Deny" />
<section name="requestFiltering" overrideModeDefault="Allow" />
The most common cause of problems related to file uploads is PHP itself. The following php.ini settings effect file uploads:
file_uploads boolean
Name |
Default |
Changeable |
Changelog |
file_uploads |
"1" |
PHP_INI_SYSTEM |
PHP_INI_ALL in PHP <= 4.2.3. Available since PHP 4.0.3 |
This parameter has to be set to 1 to accept file uploads, value 0 is to not accept file uploads. Defaults to 1
post_max_size integer
Name |
Default |
Changeable |
Changelog |
post_max_size |
"8M" |
PHP_INI_PERDIR |
PHP_INI_SYSTEM in PHP <= 4.2.3. Available since PHP 4.0.3 |
This is the maximum size of a POST request that PHP will accept. The default for PHP 4.3.x is 8M. If the file(s) you are trying to upload have a single or combined size over this value, PHP will exit. This affects the total post data. For example, if this were set to 8M and you are uploading four 3M files, PHP would not accept the files. You could, however, upload the four 3M files individually without a problem from this setting.
To upload large files, this value must be larger than upload_max_filesize.
If memory limit is enabled by your configure script, memory_limit also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size.
If the size of post data is greater than post_max_size, the $_POST and $_FILES superglobals are empty. This can be tracked in various ways, e.g. by passing the $_GET variable to the script processing the data, i.e. <form action="edit.php?processed=1">, and then checking if $_GET['processed'] is set.
memory_limit integer
Name |
Default |
Changeable |
Changelog |
memory_limit |
"128M" |
PHP_INI_ALL |
"8M" before PHP 5.2.0, "16M" in PHP 5.2.0 |
This sets the maximum amount of memory in bytes that a script is allowed to allocate. This helps prevent poorly written scripts for eating up all available memory on a server. Note that to have no memory limit, set this directive to -1.
upload_max_filesize integer
Name |
Default |
Changeable |
Changelog |
upload_max_filesize |
"2M" |
PHP_INI_PERDIR |
PHP_INI_ALL in PHP <= 4.2.3. |
This is the maximum size of an individual uploaded file. The default for PHP 4.3.x is 2M.
max_input_time ineger
Name |
Default |
Changeable |
Changelog |
max_input_time |
"-1" |
PHP_INI_PERDIR |
Available since PHP 4.3.0. |
This is the maximum time PHP will accept input in seconds.
Name |
Default |
Changeable |
Changelog |
upload_tmp_dir |
NULL |
PHP_INI_SYSTEM |
|
The temporary directory used for storing files when doing file upload. Must be writable by whatever user PHP is running as. If not specified PHP will use the system's default.
Definition of PHP_INI_* constants
Constant |
Value |
Meaning |
PHP_INI_USER |
1 |
Entry can be set in user scripts or in Windows registry |
PHP_INI_PERDIR |
2 |
Entry can be set in php.ini, .htaccess or httpd.conf |
PHP_INI_SYSTEM |
4 |
Entry can be set in php.ini or httpd.conf |
PHP_INI_ALL |
7 |
Entry can be set anywhere |
If you do not have access to change php.ini and your website is running on apache, you may be able to include these settings in an .htaccess file. This is only possible if "AllowOverride Options" or "AllowOverride All" privileges have been set (by you, by your ISP, or by a system administrator) in httpd.conf.
If this is feasible, or if you want to try the solution on your own, create or edit a file named .htaccess (assuming you want a 6Mb max attachment size):
php_value post_max_size "7M"
php_value upload_max_filesize "6M"
php_value max_input_time "120"
Permissions
If it is a Window server nothing is required and by default window gives all permissions.
For Linux and Uinx you have to give write (Chmod) permission to both temp and destination directories to allow uploaded files to store.