Hola, no soy muy experto pero eso me ocurria con el aspSmartUpLoad y encontre esto, espero te sirva (en ingles, sorry
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1) FAQ: does aspSmartUpload work on Windows 2003 server ?
Yes, last versions of aspSmartUpload work fine on the Windows 2003 server.
If you upgrade your OS and used an old version of aspSmartUpload, you have to download and setup aspSmartUpload 3.2+.
IIS6.0 prevent the upload of files more than +200Kb.
For IIS6.0 users, the 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 specifies an amount of data greater than the value of AspMaxRequestEntityAllowed, IIS returns a 403 error response. This property is related in function to MaxRequestEntityAllowed, but is specific to ASP request. Whereas you might set the MaxRequestEntityAllowed property to 1 MB at the general World Wide Web Publishing Service (WWW Service) level, you may choose to set AspMaxRequestEntityAllowed to a lower value, if you know that your specific ASP applications handle a smaller amount of data.
Open your MetaBase.XML which is located in c:\Windows\System32\Inetsrv find the line "AspMaxRequestEntityAllowed" and change it to "1073741824".
This change does not require stopping IIS, but to make the Metabase.xml file write-able, you need to go to the IIS control panel, right click the server, select properties, and check off the box that says "allow changes to MetaBase configuration while IIS is running".
