WebDAV: What is the default file size limit for Windows 7?

Question

We have an application at work that mounts a virtual drive using WebDAV. In the past we had to manually set the following values to work around the defaults used by previous versions of the Windows WebDAV client as discussed in KB 900900 .

• HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\WebClient\\Parameters\\FileSizeLimitInBytes
• HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\WebClient\\Parameters\\FileAttributesLimitInBytes

Does anyone know for sure whether the defaults are any higher in Windows 7? Is this workaround still needed?

Answer 1

This issue is still true under Windows 7 Service pack 1 and will also impact services such as online storage mounted as a windows drive.

As stated in the support article KB900900 ,

" This issue occurs because a security change that was introduced in Windows XP SP2 affects the Web Distributed Authoring and Versioning (WebDAV) redirector. This security change makes sure that an unauthorized server cannot force a client computer into a denial of service attack. If you try to download a file that is larger than 50000000 bytes, the client computer interprets this download as a denial of service attack. Therefore, the download process stops. "

Should you wish to workaround the limitation (re: increasing the limit via regedit as stated in the question), detailed instructions are available at the support article.

Answer 2

我的Windows 10上的默认值仍然是50 MByte。