RFC Connection test error

Hi everybody,

i'm creating a simple RFC destination (R3 connection) from XI to ECC 6.0.

I insert all of the information required, but when i do the connection test, there' s the following error:

ERROR service '<nameservice>' unknown

LOCATION SAP-Gateway on host <myhost> / <nameservice00>

DETAIL NiPGetServByName: service '<nameservice>' not found

CALL getservbyname

COMPONENT NI (network interface)

COUNTER 334797

MODULE ninti.c

LINE 463

RETURN CODE -3

SUBRC 0

RELEASE 640

TIME Wed Feb 06 19:15:47 2008

VERSION 37

Could somebody help me?

What i have to check or what i have to do?

Thanks a lot.

Bye,

Sonya.