Error after DISA installation

Hello!

We are using Siebel 19.6. We have already installed a DISA and performed all required actions to generate and import a CA signed certificate for localhost along with parent and intermediate certificates. However, when we open the application and try to edit any attachment (i.e. under Service Request), the below error is displayed:

File Download

You are downloading the file 'IMG_2309.jpg'. Would you like to edit the file directly or download it to your computer?

Edit button is disabled as Siebel was not able to connect to Desktop Integration Siebel Agent.

The browser inspect view contains:

WebSocket connection to 'wss://localhost:18443/' failed: Error in connection establishment: net::ERR_CERT_COMMON_NAME_INVALID