Configuration Manager - Windows Updates - Delivery Optimization Error

[StephenPink]

Hey all,

Got the dreaded 0x80D02002 error again "Delivery Optimization: Download of a file saw no progress within the defined period" for pretty much all my client Windows updates this month. 

I've definitely had this before, and definitely resolved - but it's escaping me this time. I am NOT using DO and have configured (I think) everything to support this - GPO setting the below;

• Delivery Optimization:
  • Download Mode: Enabled        
    • Download Mode: HTTP only (0)
       

Relevant Client Settings as below;

• Delivery Optimization:
  • Use Configuration Manager Boundary Groups for Delivery Optimization Group ID: Yes
  • Enable devices managed by Configuration Manager to use Microsoft Connected Cache servers for content download: No
• Software Updates:
  • Enable software updates on clients: Yes
  • Software update scan schedule:
    • Schedule: Occurs every 7 days effective 01/02/1970 00:00
  • Software deployment re-evaluation:
    • Schedule: Occurs every 7 days effective 01/02/1970 00:00
  • Allow user proxy for software update scans: No
  • Enforce TLS certificate pinning for Windows Update client for detecting updates: Yes
  • When any software update deployment deadline is reached, install all other software update deployments with deadline coming within a specified period of time: No
  • Period of time for which all pending deployments with deadline in this time will also be installed: N/A
  • Allow clients to download delta content when the option is available: Yes
  • Port that clients use to receive requests for delta content: 8005
  • If delta content is unavailable from distribution points in the current boundary group, immediately fall back to a neighbor or the site default: No
  • Enable management of the Office 365 Client Agent: Yes
  • Enable update notifications from Microsoft 365 Apps: No
  • Enable installation of software updates in "All deployments" maintenance window when "Software update" maintenance window is available: No
  • Specify thread priority for feature updates: Not Configured
  • Enable third party software updates: No
  • Enable Dynamic Update for feature updates: Not Configured
  • Enable features introduced via servicing that are off by default: Not Configured

 

Hoping I've just missed something stupid - it's been a long week... 

Cheers