.NET 4.5 was accidentally installed on an IIS node, .NET4 was uninstalled, as a result - it is impossible to use .NET 4 in CP for customers with webspaces on that node.
How to revert this?
Remove .NET45 package from the node through POA PP in Hardware Nodes >
<IIS node>> Packages tab
Uninstall .NET 4.5 from the physical node if it still present through Windows Control Panel > Add/Remove programs,
Run .NET cleanup tool on the physical node.
- Install packages ".NET4" and "ASP.NET4" through POA PP Hardware Nodes >
<IIS node>> Packages tab.