saposs rfc failed to open

hi all,

when i am trying to logon to sap in oss1 transaction it is giving the message

"Unable to connect to SAPNet message server

(Default connection will be used...)"

even i have given the correct technical values

and also when i do the connection test in saposs rfc the following error is displaying

Connection Error

Error when opening an RFC connection

ERROR: SNC processing failed: SncProcessOutput

LOCATION: SAProuter 38.10 on 'solman'

DETAIL: NiSncIInitHdlSecurity: sncrc=-4;0024FC18

COMPONENT: NI (network interface)

COUNTER: 10

MODULE: nisnc.c

LINE: 1096

RETURN CODE: -104

SUBRC: 0

RELEASE: 700

TIME: Thu Oct 08 16:33:40 2009

VERSION: 38

kindly guide me.

sravanthi