For Customers on the Global CloudSOC tenant with Gateway using gw.elastica.net and mgw.elastica.net, the CA certificate used for the Symantec CloudSOC Gateway will expire 12/12/2019.
Due to this upcoming certificate expiration date, CloudSOC is planning to change our CA certificate on November 7th, 2019. The certificate contains the same security properties as before and will be required for encrypted traffic interception by “gw.elastica.net” and “mgw.elastica.net”.
This is not an optional upgrade – deprecated Certificates are a security risk.
More information available in the Knowledge Base article/Support Alert - https://support.symantec.com/us/en/article.ALERT2689.html