Sometimes you find your WSUS server keeps crashing over and over again. WSUS is unavailable and/or the WSUS management console hangs. When you start to investigate as to why Windows Server Update Services crashes, you’ll notice the following error message being logged in the HTTPErr log files:
2017-05-08 05:03:53 203.0.113.144 56433 203.0.113.4 80 HTTP/1.1 POST /SimpleAuthWebService/SimpleAuth.asmx 503 707060612 AppOffline WsusPool
In the Eventlog you might find errors indicating that the WSUS administration console is unable to connect to WSUS Server via remote API:
The WSUS administration console was unable to connect to the WSUS Server via the remote API.
Verify that the Update Services service, IIS and SQL are running on the server. If the problem persists, try restarting IIS, SQL, and the Update Services Service.
Sometimes clients checking for Windows Updates would quickly error out with a code
0x80244021, which indicates the inability to reach WSUS.
To improve WSUS availability, you need to increase IIS Private Memory Limit. The default limit is set to 1843200KB. And when an IIS worker process uses more than 2GB, WSUS crashes and the problem occurs.
Change Private Memory Limit (KB) to a higher number that fits your server specifications or simply
0 , which means no limit, instead of the hard-coded 1843200.
Follow this path to find the setting:
Internet Information Services (IIS) Manager → Server → Application Pools → Select “WSUSPool” → Actions Advanced → Recycling → change “Private Memory Limit (KB)“.
This’ll improve WSUS availability.
A second approach may be to set
Enable 32-Bit Applications to False in the Application Pools Advanced Settings. This’ll disable the 32-bit mode for WSUSPool, and forces it to run 64-bit. Be sure to have an ISAPI Filter set for 64-bit Framework as well!
[void][reflection.assembly]::LoadWithPartialName("Microsoft.UpdateServices.Administration") $wsus = [Microsoft.UpdateServices.Administration.AdminProxy]::getUpdateServer("wsus-server",$False) $wsus.Version
My name is Jan. I am not a hacker, coder, developer, programmer or guru. I am merely a system administrator, doing my daily thing at Vevida in the Netherlands. With over 15 years of experience, my specialties include Windows Server, IIS, Linux (CentOS, Debian), security, PHP, WordPress, websites & optimization. Want to support me and donate? Use this link: https://paypal.me/jreilink.
Install Windows Server Servicing Stack Updates (SSU) using PowerShell
Security baseline for Windows 10 v1903 and Windows Server v1903 – final release
Setting up Monit monitoring in Windows Subsystem for Linux WSL
How to verify SMBv1 is disabled in Windows and Windows Server
Silently import .reg file in your Windows registry
How to uninstall and remove Adobe Flash Player in Windows Server
How to set SVN_EDITOR environment variable in Windows Server
Manually fail-over all databases in an SQL Server Database Mirroring configuration