WEBIDE personal edition and access to GW via SSO

Hello.

I've installed Webide in my local PC and would like to create destination to SAP Gateway(in the same local network, not visible in internet ). My SAP GW requires login with SSO certificate, login using user\pass deactivated.

I've tried with several combinations but get an error 500 Internal server error. From browser address is reachable and metadata fetched.

How should I configure destination in that case(certificate login, keystore)?

P.S.

I was able to create destination to ES4 system and consume oData service, but that is because ES4 uses Basic Auth.

Michael.