SYMPTOMS

Downloading an attachment shows that the saved file is 0k in size.  There may also be an entry in the event log indicating "Response Buffer Limit Exceeded".

CAUSE

IIS6.0/Windows 2003 uses a setting called AspBufferingLimit' to specify the maximum number of bytes allowed in the body of an ASP response. The default for this is 4194304 (4Mb).

RESOLUTION

Instructions for resolving this issue follow:

1. Stop the World Wide Web Publishing Service. This can be done from the Windows Command Prompt as: net stop w3svc
2. In the C:\Windows\System32\Inetsrv directory, find a file called metabase.XML.
3. Copy the original file in Notepad and find the line "AspBufferingLimit".
4. Change the value of this entry to a higher value.
5. Save the file.
6. Start the World Wide Web Publishing Service. This can be done from the Windows Command Prompt as: net start w3svc

Note: If the Metabase.XML file is locked, try starting Windows in Safe-mode to be able to change that file. The change should be able to be made without stopping the web services by opening the IIS control panel, right clicking on the server icon in the treeview, selecting Properties from the popup menu and selecting the option labelled "Allow changes to MetaBase configuration while IIS is running".

MORE INFORMATION

Error 'The attachment could not be added to the message' when uploading files under Windows 2003: http://www.mailenable.com/kb/content/article.asp?ID=ME020179

Attachments being removed: http://www.mailenable.com/kb/content/article.asp?ID=ME020266