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

Question

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 :

Answer 1

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.