Attempt to establish a connection via NiConnect has failed

Hi
We recently migrated from Windows to UNIX.
The RFC destination between SAP to XI, was working fine before migration and after migration it is not working.
I checked the System log using SM21.
Following are the error details
"The attempt to establish a connection via NiConnect has failed. The
following system log entries specify the NiConnect parameters.
Check whether the target system or the target gateway are active."
When we test connection from SM59
Following are the error details
"Connection Error
Error when opening an RFC connection
ERROR: service 'SAPGW00' unknown
LOCATION: SAP-Gateway on host DEVSRV / sapgw00
DETAIL: NiHsLGetServNo: service name cached as unknown
COMPONENT: NI (network interface)
COUNTER: 6511
MODULE: nixxhsl.cpp
LINE: 776
RETURN CODE: -3
SUBRC: 0
RELEASE: 700
TIME: Tue Jun 2 11:35:31 2009
VERSION: 38
Can you pls help
Regards
Madhan D

Have you specified correct gateway information in SM59 because it looks like sap gateway is incorrect..
thanks sunny

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http://technet.microsoft.com/en-us/library/ff487858(v=sql.110).aspx
Finally, here is a good article regarding how to troubleshoot PowerPivot data refresh for your reference. Please see:
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http://social.technet.microsoft.com/wiki/contents/articles/3870.troubleshooting-powerpivot-data-refresh.aspx
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