RFC Destination 500 internal error

Hello Experts,

Pardon me for asking a basic question.

We have installed a new SAP PI 7.4 Java only. As part of proxy connection enablement from ECC to PI, I have followed below blog of Michael.

http://scn.sap.com/people/michal.krawczyk2/blog/2012/01/19/michals-pi-tips-how-do-you-activate-abap-proxies-with-aex--simplified-version

The RFC destination SAP_PROXY_ESR is working fine when did "connection test". But the other RFC destination "PI_AAE" is failing with "500 internal server error". Performed "SLDCHECK" and everything is fine.

Could you please help in debugging and identifying the issue

Thanks,

NJ