How do I verify that I have TLS/SSL connectivity to Duo's service?

From a browser
Attempt to reach https://api.duosecurity.com/auth/v2/ping via a web browser on the same network as your server. Successful access will result in a web page displaying a JSON response code. Example:

"response": {"time": 1445354727}, "stat": "OK"}

This indicates that port 443 is open, which is necessary for communication to our cloud service. Note: This browser test is specific to the device you're testing from and may not have the same egress point as a firewall or other device you're attempting to integrate with Duo.

If you are able to access the URL above, check the certificate used to access that site by clicking on the icon beside "https://"" in your browser bar. The certificate should be issued by *.duosecurity.com. If it is issued by some other site, then there is likely an SSL proxy. In that case, make an exception in the SSL proxy for *.duosecurity.com
If you are not able to access the URL above, or do not receive a JSON response code similar to the example, there may be a firewall rule in place preventing communication.
If you receive an error message when accessing the page via Internet Explorer, you need to download and install the following certificates from https://www.digicert.com/digicert-root-certificates.htm in the local certificate store for all users (Note: This most commonly affects Windows Server 2008 R2 or earlier, but it is possible that later server versions may also lack the proper certificates):
- DigiCert High Assurance EV Root CA
- DigiCert SHA2 High Assurance Server CA

Via Telnet
This approach will provide accurate information regardless of network configuration.

From a command line, run:

telnet <IP address/API-hostname> 443

Successful connection is usually determined by a message such as "Connected to api.duosecurity.com," but may vary depending on the method used to establish the telnet connection. If the connection is not successful, there may be a firewall rule in place preventing communication.

Via PowerShell
This method is useful as it will also provide accurate information regardless of network configuration.

From a PowerShell Command line, run:

Invoke-WebRequest -Uri https://api.duosecurity.com/auth/v2/ping

Note: If you have TLS 1.0 disabled, run the following command before the command above:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

A successful response should look similar to the Content section below highlighted with italics:

StatusCode        : 200
StatusDescription : OK
Content           : {"response": {"time": 1481915427}, "stat": "OK"}
RawContent        : HTTP/1.1 200 OK
                    Connection: keep-alive
                    Pragma: no-cache
                    Strict-Transport-Security: max-age=31536000
                    Content-Security-Policy: default-src 'self'; img-src 'self' ; connect...
Forms             : {}
Headers           : {[Connection, keep-alive], [Pragma, no-cache], [Strict-Transport-Security, max-age=31536000],
                    [Content-Security-Policy, default-src 'self'; img-src 'self' ;
                    connect-src 'self']...}
Images            : {}
InputFields       : {}
Links             : {}
ParsedHtml        : System.__ComObject
RawContentLength  : 48

If you are running Powershell 2.0 on Server 2008R2, you may experience an issue trying to run invoke-webrequest due to the command not being found. This commandlet was not introduced until Powershell 3.0. You can install it on Powershell 2.0 from the following Microsoft page:
https://www.microsoft.com/en-gb/download/details.aspx?id=40855

来源：CSDN

作者：weixin_39833509

链接：https://blog.csdn.net/weixin_39833509/article/details/103595174

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tls