WSUS replica server not downloading updates

Question

I have a WSUS upstream server and 2 downstream servers setup as replicas. The upstream server connects to Microsoft only to get the updates list and metadata, don't download the packages, the approvals works and are copied by the replicas. I have set up the replicas to download updates from Microsoft instead of the upstream server to avoid a large amount of WAN traffic, the replicas recognise the amount of KB to download but it the donwload don't start, I don't have proxy configured.
Thank you

Answer 1

If you change a replica to sync to MS, does it then download the updates? If not, check firewall ruleshttps://learn.microsoft.com/en-us/windows-server/administration/windows-server-update-services/deploy/2-configure-wsus#211-configure-your-firewall-to-allow-your-first-wsus-server-to-connect-to-microsoft-domains-on-the-internet

Or perhaps put Bits into foreground mode

https://www.ajtek.ca/wsus/wsus-bits-foreground-priority-mode-vs-background-priority-mode/