Web Dynpro application calling external web server using HTTPS giving error

Hello,
I don't know whether this is the right question in this forum but my ABAP web-dynpro applicaiton is expected to call another HTTP application on external web server through HTTPS. Presently it is calling through plain HTTP but we want to have HTTPS.
Here are the steps that we followed based on the link from help.sap.com
1] Received the certificate files from external web server
2] Created SSL Anonymous client
3] Imported the certificate files under this client and added into the certificate list
4] Re-started ICM
5] Created RFC Destination of type HTTP to connect to external server with SSL option and basic authentication. This RFC destination was working under plain HTTP.
When tried with Test connection it gave error "ICM_HTTP_CONNECTION_FAILED".
Any idea what might be missing. Thanks in advance.
Regards
Rajeev

Used proper certificate after which the error went away

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