Then the client reports an update error 0x8024401c and fails with the update. When the timeout is hit, ASP.NET disconnects the client and aborts the thread doing the metadata retrieval. Some of the metadata in the database is compressed, so not only must it be retrieved, it must be decompressed into memory, which is an expensive operation.įor large metadata packages and many simultaneous requests, it can take longer than ASP.NET's default timeout of 110 seconds to retrieve all of the metadata the client needs. Further requests for the same update revision will retrieve the update metadata from memory instead of reading it from the database. WSUS has a caching mechanism whereby the first time update metadata is requested by any client WSUS will store it in memory. Those symptoms occur after installing an update for Windows 10 Version 1607 clients (Updates KB4022723, KB4022715, KB4025339 etc.). Mostly 500 errors for the /ClientWebService/Client.asmx requests in the IIS logs.Clients failing to scan with 8024401c (timeout) errors in the WindowsUpdate.log.Constant recycling of the W3wp.exe hosting the WsusPool (identifiable by the PID changing).High memory in the w3wp.exe process hosting the WsusPool – customers have reported memory usage approach 24GB.High CPU on your WSUS server – 70-100% CPU in w3wp.exe hosting WsusPool.Microsoft has posted an article High CPU/High Memory in WSUS following Update Tuesdays, explaining, what's going on under the hood. Microsoft explains the background for this error Microsoft finally has confirmed this issue, and I found on Auga blog post WSUS SUP causes high CPU and clients fail updates scan mentions a high CPU and RAM load and posts some hint to fix this issue. I've discussed this issue within my blog post Windows 10 (V1607): KB4034658/KB4034661 causes WSUS error 0x8024401c. Same as HTTP status 408 – the server timed out waiting for the request. Both updates are causing WSUS issues, the clients are reporting error 0x8024401c during update search. In August 2017 Microsoft released two cumulative Updates KB4034658 (August 8, 2017) and KB4034661 (August am 16, 2017) for Windows 10 Anniversary Update (Version 1607).

Windows 10 update kb4025339