On a Linux server when you upload files using the default upload function the File Manager sends a small part of the file to the server and then
requests a sever response to establish that the server has received the fragment of the file correctly and the time taken, from this it can then
calculate the current upload progress and display this value in the progress bar.

Some servers perform write-caching, which means that the server forces the File Manager to upload the whole file to memory and then when the file is fully uploaded the file is then moved from memory to the disk. If this happens the File Manager has no way to read the status of the upload as it is all being sent to memory. It tries to constantly request the status from the server but if no status is returned it then returns the error: Status Bar Unable To Detect Server Response!

The common solution to servers with write-caching, for all scripts that need to upload files to the server (blogs, forums other file management software, i.e not just iDC File Manager) is to upload a .htaccess file containing the following code:

<IfModule mod_security.c>
 # Turn off mod_security filtering.
 SecFilterEngine Off

 # The below probably isn't needed,
 # but better safe than sorry.
 SecFilterScanPOST Off
</IfModule>

99% of the time this resolves the issue and this allows files to be uploaded correctly.

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