It's odd. It's affecting some users on external connections but not others:

I have tried on our network, at home, with 24h2 and 23h2 and the same results. 

[24-12-11 10:45:58] {Update.Operations.Domain.RemoteFile->INFO} Download incomplete.
[24-12-11 10:45:58] {Update.Operations.Domain.RemoteFile->INFO} BITSDownload Failed. Falling Back to HttpWebRequest Download.
[24-12-11 10:45:58] {Transfer.HttpWebRequestFileTransferManager->ERROR} Error occurred while downloading file.
[24-12-11 10:45:58] {Transfer.HttpWebRequestFileTransferManager->ERROR} Web exception message : The remote server returned an error: (403) Forbidden.
[24-12-11 10:45:58] {Transfer.HttpWebRequestFileTransferManager->ERROR} Web exception status : ProtocolError
[24-12-11 10:45:58] {Transfer.HttpWebRequestFileTransferManager->ERROR} Http web response status code: Forbidden

Talked with our Dell rep. It's a known issue and they're working on it. They hope to have it fixed before EOD today.