Hi Apu,
some things that come to my mind
- You probably only need the root certificate within keystore. No need for intermediate / server certificate. However, they do no harm either
- I don't think that it's an certification based error when looking at the error of the channel ping. I'm thinking more in the like of wrong URL, too
- You really should get XPI Inspector http://service.sap.com/sap/support/notes/1514898 to narrow down this sort of problems. Invaluable tool IMHO
- Alternatively to XPI Inspector increase tracing level for the affected categories (have a look at your current developer trace, examine if the error which you get on ping shows up there, use the category from there to increase trace level)
HTH Cheers
Jens