We will have to choose DER encoded binary and click on Next. After we perform all the above steps, we will be redirected to a new window where we need to select the format for the certificate.After clicking again, a new window will pop up. From there we have to select the Details tab and from the Details click on Copy to File. Once we select the certificate, it will redirect to another window.Click on this icon and a window will pop up. Now to the left of the URL there is a lock icon ( ).Take the particular URL from the error and copy it to a browser (In the above error the url is ).To download the certificate, follow the below steps: We just need to install the required certificates of the external system in our system so the firewall allows us to interact with the external system and complete our process. The firewall requires a valid certificate to allow access to the external systems.

The system firewall restricts the application to connect to external unsecured systems. Reason: The error due to the system firewall. While developing some application, we might sometimes come across below error which the maven throws while building the application:

Plugy checking library failed