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Reference values

Item Value in our lab
Offline network Hyper-V internal switch OfflineNet, 10.0.0.0/24, no NAT and no gateway
Offline WSUS 10.0.0.10, port 8530, content at C:\WSUS\WsusContent
Online WSUS Content at C:\WsusContent, manual sync, foreground download priority on
Client policy WUServer and WUStatusServer = http://10.0.0.10:8530, UseWUServer = 1, DoNotConnectToWindowsUpdateInternetLocations = 1
Carry archive per month 5.25 GB (June), 5.42 GB (July), 5.34 GB (August), 13.4 GB the first time. Server 2025 August: 3.89 GB
Catalog export always complete. About 86 MB in the first runs, 3.1 MB after trimming to 12 months (181 updates)
Typical timings Download 1.5 min to 8 min, each copy hop about 1.5 min, hash check about 1 min, client install about 15 min, wait after restart 20 to 25 min. Server 2025 update: download from its own WSUS 10 min, install 16 min, two restarts, sign-in screen within 9 min of the restart command
Build numbers March 26200.8037, April 26200.8246, May 26200.8457, June 26200.8655, July 26200.8875, August 26200.9168. Server 2025: original 26100.1, August 2026 26100.33296
Update IDs April KB5083769: 85961d5c-6c88-47e6-b6ce-07c1d8dd0cb7
May KB5089549: a8f81155-2519-4821-8f73-74283c5bd00b
June KB5094126: d5b11ba8-f08e-4fcb-97f8-5f5b1c6e226b
July KB5101650: 99751b16-0794-4995-925d-9840365e1133
August KB5121003 (Windows 11 25H2 x64): 8e007475-a729-445f-96ec-eae1299f3f93
August KB5120233 (Server 2025 x64): 37b7fb30-903d-480a-b672-1b8960239fe3
Update install result History code=2 and hr=0x00000000 is success. code=4 is failure.
Logs WSUS: C:\Program Files\Update Services\LogFiles\SoftwareDistribution.log
BITS: event log Microsoft-Windows-Bits-Client/Operational
Client servicing: C:\Windows\Logs\CBS\CBS.log and C:\Windows\Panther\setuperr.log

Sources we used