To resolve the issue, the recommendation is to obtain a device certificate for Pulse One which is signed by a trusted certificate authority. If the certificate is signed by a private certificate authority, the root certificate authority (CA) must be installed on each Pulse Connect Secure / Pulse Policy Secure device.
Workaround:
One method
to retrieve the self-signed certificate is via your web browser. With the following instructions a user can connect to the Pulse One UI and use browser options to download the self-signed certificate.
For Chrome v64, click the lock icon in the top left side of the browser window in the URL bar, select details and copy to file.

For Internet Explorer 11 you’ll need to first run IE as an administrator. You can close IE, then find iexplorer.exe in Windows, right click it, and select run as administrator. Once you do that connect to Pulse One and right click the web page and select properties. From there select certificate. Once the certificate is opened select details and copy to file.

For Firefox v58, select the lock icon in the URL bar, then click on the arrow to the right to show connection details.