Search code examples
visual-studioasp.net-corelocalhostvisual-studio-2019iis-express

Visual Studio 2019: "This site can’t provide a secure connection" on localhost

I've installed Visual Studio 2019 and uninstalled Visual Studio 2017.

Now if I start an ASP.NET (Core) site with https, it always say on Chrome:

This site can’t provide a secure connection

or on Edge

Can’t connect securely to this page

Screenshots:

Chrome:

enter image description here

Edge:

enter image description here

The URLs are correct. This also the same http://localhost:56784/ (it redirects to https)

enter image description here

Tried

What I've tried:

  • Updated Visual Studio 2019
  • Create a new ASP.NET Core 2 website
  • Tested with a ASP.NET site (non core)
  • Remove IIS certificates with MMC
  • Checking/changing the IIS settings in Visual Studio 2019 (project properties with context menu and project properties with F4)
  • Searching on Stackoverflow & Google ;)
  • Repair Visual Studio 2019

Issue

I think the issue is introduced by:

  • Installing Visual Studio 2019 and/or,
  • Uninstalling Visual Studio 2017 and/or,
  • Updating Windows 10 (current Version: 10.0.18362 Build 18362)

The underlining issue looks like a wrong/old/not supported TLS version?

Question

What can I do to diagnose/fix the problem?

Solution

  • Repair of IIS Express fixed my problem:

    enter image description here