I have been chasing my tail for a couple of weeks on this issue, and I am finally submitting myself to Technet. I have no clue what to do.
I have one deployment out to around 2,300 machines. Of those, 311 are still "waiting for content." We have fallback distribution points, and a Azure-hosted dp, so there's really no reason why anyone would be "waiting for content." The content is available on all DPs. I have verified the content, and I have even removed the content and redistributed it. I just have no idea where to go next.
These are the errors in DataTransferService.log that I have seen on dozens of these machines.
Error sending DAV request. HTTP code 600, status ''
GetDirectoryList_HTTP('http://sccm-nossl.abc.local:80/SMS_DP_SMSPKG$/ABC00088') failed with code 0x87d00215.
Non-recoverable error retrieving manifest (0x87d00215).
I am seeing this on multiple distribution points. Being as I have 1,700 other clients that have successfully installed from all of my DPs, so it really doesn't make sense and it's obviously incorrect. Also, these errors appear on our Azure dp, which I would think I can be pretty confident that it's configured correctly.
Any help you can provide would be greatly appreciated.