AspMaxRequestEntityAllowed property specifies the maximum number of bytes allowed in the entity body of an ASP request. If a content length header is present and requires an amount of data greater than the value of AspMaxRequestEntityAllowed, IIS may return a 403 error response.
You may also experience cases when an uploaded file is not present despite being uploaded successfully or no error is returned. Any file that is being uploaded after AspMaxRequestEntityAllowed value has been exceed will not be saved. While the temp files may be created and seen in the directory, they are not and won’t be saved.
As such, you need to increase the AspMaxRequestEntityAllowed value to solve this problem.
Step 1 – Login into Plesk.
Step 2- Click on “Virtual Directories”.
Step 3 – Click on “Directory Properties”.
Step 4 – Change the value of “Maximum size of entity body of an ASP request (KB) to your desired value. Do remember 1MB is 1024KB.
Step 5 – Click “OK” to save and apply the changes.