When experiencing destination connectivity problems, please follow the noted steps and include the results in your post.
Using one of the templates, File -> New -> Project From Template, provide the necessary information up to the point of where you select your destination. You may want to clear the console prior to selecting the destination, check the link for the steps. After selecting the destination you should see an error displayed in the console. Right click on the link in the console and choose Open link in New Tab.
At this point you should see an error within the browser window. Provide this, your destination configuration and your HANA Cloud Connector configuration.
Error: Cannot open tunnel with id account:///<USER ID>trial
Cause: Most likely the HANA Cloud connected is not connected or not running.
Error: Unable to open connection to backend system
Cause: Check the Internal Host name in the Cloud Connector
Error: Connection reset by peer
Cause: Check the protocol of the backend system in the Cloud Connector
Error: Access denied to resource /sap/opu/odata/IWFND/CATALOGSERVICE/$metadata on system…
Cause: Check the URL Path or Access Policy of the “Resources Accessible” of the connection in the Cloud Connector
Error: HTTP Status 500 – Could not connect to remote host
Cause: The destination url can not be accessed, maybe a typo or an incorrect Proxy Type
Error: Astaro Security Gateway….
Cause: Check the Proxy Type of the destination