How to solve “Microsoft Visual Studio (VS)” error “Unable to connect to the configured development Web server”

Question

PROBLEM

If you start using \"Microsoft Internet Information Services Express (IIS)\" from \"Microsoft Visual Studio (VS)\" you may get when you run

Answer 1

Visual Studio 2015, Windows 10, project source control was managed in TFS Online.

None of this worked form me, issue appeared after a reformat of Windows 10 and subsequent reinstall of VStudio 2015. I mapped projects to the same folder (residual folders and files were still there.)

Deleting the entire old project (specifically the .VS) and then remapping it fixed everything.