CA Developer Portal: Cross-Origin Resource Sharing request pre-flight failure

Document ID : KB000118055
Last Modified Date : 23/10/2018
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Issue:
In Portal 4.2.x, when testing Portal APIs via API Explorer you receive the below error:
 
Error: Unable to make request. This may be due to a network error or a Cross-Origin Resource Sharing request pre-flight failure.
Resolution:
API explorer makes uses of SwaggerUI. In order to complete the request you will need to have accepted the proxy certificate before the request goes through. To do this open the URL specified in a new browser tab to accept the certificate.

 accept the proxy certificate before the request goes through
i.e:

https://apim-ssg.subdomaincom:9443/auth/oauth/v2/token