RFC connection (SM59) fails with load balancing enabled.

Hello All,
We have an RFC connection setup between two SAP systems. The RFC connection works fine if it points to the destination system. But if we enable load balancing, the connection fails with this error:
ERROR                partner not reached (host <hostname>, service sapms<SID>)
LOCATION             SAP-Server <source system> on host <host name of source> (wp 1)
DETAIL               NiPConnect2
CALL                 SO_ERROR
COMPONENT            NI (network interface)
COUNTER              3027
ERROR TEXT           Connection refused
ERROR NUMBER         79
MODULE               niuxi.c
LINE                 1069
RETURN CODE          -10
SUBRC                    0
RELEASE              46D
TIME                 Mon Aug 18 18:33:30 2008
VERSION              34
I've checked the /etc/services file, the following entries exist
sapms<SID> 3606/tcp
sapms<SID>s 3600/tcp
lstst at the source system works fine
lgtst -H <target host name> -S sapms<SID>
niping at the target system has a problem
> niping -c -S 3606
Mon Aug 18 10:23:14 2008
connect to server o.k.
ERROR => NiTClientLoop: NiTReadLoop (rc=-6) [nixxtst.cpp 2629]
ERROR       connection to partner broken
TIME        Mon Aug 18 10:23:14 2008
RELEASE     640
COMPONENT   NI (network interface)
VERSION     37
RC          -6
MODULE      niuxi.c
LINE        905
DETAIL      NiPRead (0.0.0.0/0, hdl 1)
SYSTEM CALL recv
COUNTER     1
Please help me figure out the problem.
regards,
Roshni

Hi,
I think you have added wrong port entry in services file.
The entry of sap servers in services file for load balancing are
sapms<SID> 36<instance number>/tcp
so please check once again and add the entry using above formula in services file.
Also add the entry of all SAP servers in your hosts file.
<IP> <HOSTNAME>

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