Getting SSL error "Unsupported protocol" when running in Visual Studio

user_12962824 0
Viewed 17732

I am trying to build a Blazor application and I always get the following error : "This site can’t provide a secure connectionlocalhost uses an unsupported protocol. ERR_SSL_VERSION_OR_CIPHER_MISMATCH Unsupported protocol The client and server don't support a common SSL protocol version or cipher suite."

My Chrome browser is up to date. I tried with Edge but the same error ! I tried the following link, too : https://phoenixnap.com/kb/fix-err-ssl-version-or-cipher-mismatch

Until a day all was working fine and I don't know what happened... If I run the same application on another Windows 7 PC, it is working fine... Can you help me, please ? I will put here a screen capture : enter image description here

blazor browser
4 Answers

Same problem for me.

Working with VS19

Tried a lot of things such as:

  • deleting localhost certificates,
  • repairing IIS Express 10,
  • clearing browser data and certificates cache,
  • deleting .vs folder,
  • allowing every TLS and SSL options in the browser

My .NET Core web apps are working under IE. So my guess is also that it's a Chrome update problem. But I haven't found how to fix that. :-(

user_181878220

Experienced the same issue. Managed to get it sorted by downloading IIScrypto and enabling the Best practices TLS and Cipher versions.

user_186197390

You can use firefox Firefox: about:config "tls" > security.tls.version.min=1. Reset to 3 after completion.

  1. Install Firefox.

  2. Type "About:config" in the address bar and hit return.

  3. Click "Accept the risk" and continue.

  4. Type "tls" in the search bar and hit return.

  5. Click the pencil icon at the far right of "security.tls.version.min" to edit the cutoff setting prevening your login, which is currently 3.

  6. Type "1" and hit return.

user_23660430

I have the same problem. I work with Windows 7 Visual Studio 2019 browser chrome. The problem was solved in this way: Open the project properties - debugging - uncheck the box "use SSL".

user_192648710
Related