After Windows 10 and Windows Server 2016 Update 1709 (Fall Creators Update), the MET/TEAM website give a 503 "Service Unavailable" error page. The event log shows Event ID: 5189.
Symptoms:
Error page persists after stopping and starting the Application Pool in IIS. After starting the MET/TEAM website in IIS's Application Pool, it just keeps stopping.
Cause:
The Fall Creators Update for Windows 10 and Windows Server 2016 (Update 1709) causes Windows to stop the Windows Activation Service (WAS) which causes the system to remove temporary configuration files that it needs to run IIS.
Steps to Resolve:
To resolve this problem, manually delete the symbolic links that are created by Windows Update. To do this, follow these steps.
Note Symbolic links can be deleted the same as regular files.
1. Open a Windows PowerShell window by using the Run as administrator option. To open an elevated PowerShell prompt, in the taskbar search, type powershell. Now see the result Windows PowerShell which appears on the top. Right-click on it and select Run as Administrator.
2. Run the following commands:
Stop-Service -Force WAS
Remove-Item -Recurse -Force C:\inetpub\temp\appPools\*
Start-Service W3SVC
3. Restart Application Pools in IIS.
More information can be found on the Microsoft website.