I::000 error in IDOC to IDOC scenario

Hi,

I am trying to configure my XI to connect to an ECC system. I have a service user ID/password for that ECC system and have configured the relative RFC destination and port. The problem is, when I try to load the IDOC metadata to test my connectivity in idx2, it throws an error 'I::000'.

There are no firewall involved, and I am pretty sure that the service user ID has the relavant authorizations since the user has been copied from my production system. I have a HR system configuration also, and that metadata loaded successfully.

Is there something I am missing?

cheers,

Prashanth