RFC connection (SM59) fails with load balancing enabled.

[Former Member]

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

[Former Member · Accepted solution]

At the target system:

Run SMLG

Double click on the logon group

Go to Attributes tab

Check "Ext.RFC enabled" button and Save

[Former Member]

Hi,

Please delete your old setting of load balancing and create again then you will not found any problem. Due to wrong port number using, you are getting the error message.

Anil

[Former Member]

The port number, 3606 is correct, /etc/services and /etc/hosts files is also correct.

I have tried with new logon groups and new RFC destinations too. No luck.

regards,

Roshni

[Former Member]

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>