After installing Microsoft patches, the Active Roles Web Interface may show the following error message:
HTTP Error 503. The service is unavailable.
The Application Event Viewer logs may show an error similar to the following:
The System Event Viewer logs may show an error similar to the following:
There is a known issue in several Microsoft .NET updates released in July 2018, including but not limited to the following updates:
Uninstall the affected .NET updates and restart the Active Roles Web Interface host.