Yes, Denodo Express 7.0 supports SSL to secure the connections between Denodo Platform servers and its clients. If I need to enable SSL, I would make sure that all the steps are followed for [**enabling SSL**](https://community.denodo.com/docs/html/browse/7.0/platform/installation/postinstallation_tasks/enable_ssl_connections_in_the_denodo_platform_servers/enable_ssl_connections_in_the_denodo_platform_servers) in Denodo Express installation.
If I face a similar scenario, I would perform the following steps to identify the issue:
* Check **vdp.log** file located under “<DENODO_HOME>/logs/vdp” folder to see if there is any error listed in the logs.
* Also, check that the [**ports**](https://community.denodo.com/docs/html/browse/7.0/platform/installation/appendix/default_ports_used_by_the_denodo_platform_modules/default_ports_used_by_the_denodo_platform_modules#default-ports-used-by-the-denodo-platform-modules) are configured properly with respect to the SSL connection. For example, Web Container uses 9090 port as default for http connections and 9443 for https connections.
* If the Denodo Platform runs behind a firewall, I have to make sure to open the ports in the firewall.
You can also take a look at [**Limitations of Denodo Express**](https://community.denodo.com/docs/html/browse/7.0/platform/installation/appendix/limitations_of_the_denodo_express_license/limitations_of_the_denodo_express_license#limitations-of-the-denodo-express-license) section of Denodo Platform Installation Guide and [**Cannot trust the server to establish a SSL connection**](https://community.denodo.com/kb/view/document/Cannot%20trust%20the%20server%20to%20establish%20a%20SSL%20connection?category=Security) Knowledge Base Article for more information.
Hope this helps!