Why can't I upload files in the backend of my website?

Your system is Win2003. default asp max data transfer is 200K

First, stop the following services:

Simple Mail Transfer Protocol (SMTP)

World Wide Web Publishing Service

FTP Publishing Service

HTTP SSL

Then, edit in Notepad (never use a writing pad): C:\Windows\system32\inetsrv\metabase.xml \Windows\system32\inetsrv\ metabase.xml

Find: AspMaxRequestEntityAllowed="204800" Default is 204800 (200k), change to what you need! For example: 999999999, save

Finally, start the service that was stopped above, even if it is finished!

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You can't fix it yourself

But you can ask your provider to increase it

This is the default setting, which is normally changed by your provider. I think they forgot to do it.