You have imported a certificate chain to the .keystore in the tomcat folder on the Enforce as per Create, sign, and import an SSL certificate signed by a Trusted Certificate Authority for the Enforce Console Certificate
You are able to import the certificate without error but after restarting the DLP services the console is not accessible
Release : 15.7
Component : Third party certificates
Not known
Converting the .keystore from Java Keystore (jks format) to pkcs12 format after importing the certificate chain, resolved the issue in this instance.
Example steps to perform this are on the third party site here.