During TLS handshake, client machine makes a request to IIS server by sending Client Hello package. Then the server responds it with Server Hello.
If the server is not sending Server Hello package, the communication won’t be established and the customer is likely to see error messages below:
This page can’t be displayed
Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to again
This site can’t provide a secure connection
The website sent an invalid response
Keep in mind that the TLS protocol errors above might be misleading. However, you should start the troubleshooting by analyzing TLS negotiation first.
Here are the steps to go through:
If you don’t see any issue with TLS protocol and network devices, continue the troubleshooting by focusing on the web server:
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