Windows Server 2003 IIS comes with FTP default support for the continuation of the breakpoint, but Windows Server 2008/R2 is not supported by default, so you need to pay attention to the settings in order to allow it to support the continuation of the breakpoint, better utilize the valuable server bandwidth resources.
1. Open IIS Manager, select the FTP site, click "Advanced Settings" on the right,
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2. In "Advanced settings", pop up the form, expand "File Processing", set "keep partial upload" to True, click "OK" to save, it will take effect.
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This article from "It Technology Learning and communication" blog, declined reprint!
Set iis7/iis7.5 FTP to support breakpoint continuation