Based on my troubleshooting, the file size limit of WebDAV is 50 MB and the timeout limit is 30 minutes. To change the limits, you are required to modify the parameters of the registry in your WebDAV server. The changes are as follows:
1. Modify the file size limit
a. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WebClient\Parameters
b. Change the value of FileSizeLimitInBytes to ffffffff
2. Modify the timeout limit
a. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MRxDAV\Parameters
b. Change the value of FsCtlRequestTimeoutInSec to ffffffff
After the modification, your new file size limit will be 4 GB and the timeout limit will be 119 hours. Please note that there is no way that you can set it to be unlimited.
References:
1. You cannot download more than 50 MB or upload large Files when the upload takes longer than 30 minutes using Web Client in Windows 7
http://support.microsoft.com/kb/2668751
2. netj / Fix-Windows7-WebDAV-Parameters.reg
https://gist.github.com/netj/1833784
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