(102) RFC_ERROR_COMMUNICATION. Not able to figure out.

[Former Member]

Hello,

When I test/ping the JCo connection, I get this error:

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message 
server host failed Connect_PM  TYPE=B MSHOST=ecquality GROUP=GEMS_GROUP 
R3NAME=ECQ MSSERV=sapmsECQ PCS=1 ERROR       hostname 'ecquality' unknown TIME
Mon Mar 23 22:00:09 2009 RELEASE     700 COMPONENT   NI (network interface) VERSION
38 RC -2 MODULE nixxhsl.cpp LINE 223 DETAIL NiHsLGetNodeAddr: hostname cached as unknown COUNTER 2 

I read many threads and tried various steps. Can anybody tell me how to fix.

Thanks

Tony

[Former Member · Accepted solution]

Looks like you have given some wrong host name while creating JCOs..

[nikhil_bose]

Tony,

Are you able to ping the server 'ecquality'? from J2EE server? Usually this is the error when the server can't connect to other machine in network.

logon to 'ecquality' system: T.Code SMLG and check the group GEMS_GROUP has ext-RFC enabled checked. if not check and save assignment.

alternatively, you can find the cause from dev_jrfc.trc file available under saploc\<SID>\JC<nr>\j2ee\cluster\server0\

[Former Member]

The actual problem was the host name had been changed by our network people(couldn't ping), and the group configuration on the R3 was also messed up.

[former_member185086]

Hi

Have u done the host file entries for those system which u define in the jco.(After this restart the system)

Best Regards

Satish Kumar

[Former Member]

I added host file entries for the system that I defined in the jco (Message server). I still get the error

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to 
message server host failed Connect_PM TYPE=B MSHOST=ecquality 
GROUP=GEMS_GROUP R3NAME=ECQ MSSERV=sapmsECQ PCS=1 ERROR service 
'sapmsECQ' unknown TIME Tue Mar 24 00:53:26 2009 RELEASE 700 COMPONENT 
NI (network interface) VERSION 38 RC -3 MODULE nixxhsl.cpp LINE 776 
DETAIL NiHsLGetServNo: service name cached as unknown COUNTER 1 

[Former Member]

On the portal server in services file add the entry

%WINDIR%system32driversetc

sapmsECQ 3600/tcp # SAP System Messaging Service Port

This should work!

For Troubleshooting SAP Java Connector (JCo) , take help of this wiki:

https://www.sdn.sap.com/irj/scn/wiki?path=/display/ep/troubleshootingSAPJavaConnector%2528JCo%2529

Regards,

Anagha

[Former Member]

Hi Tony ,

Are you getting this error while test/pinging both Application data and Dictionary data ??

Regards,

Abhijeet

[former_member185086]

Hi

Take help form [this|https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/d0019b1a-775f-2910-beb8-d81f27d0d8d0] and [this|https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/7a16201d-0d01-0010-07a6-a3c56470d8f4] threads.

Best Regards

Satish Kumar

[Former Member]

Hi Anagha,

I did what you said and restarted the server. Still I get this error:

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to 
message server host failed Connect_PM TYPE=B MSHOST=ecquality 
GROUP=GEMS_GROUP R3NAME=ECQ MSSERV=sapmsECQ PCS=1 ERROR partner 
'ecquality:sapmsECQ' not reached TIME Tue Mar 24 01:21:32 2009 RELEASE 
700 COMPONENT NI (network interface) VERSION 38 RC -10 MODULE nixxi.cpp
 LINE 2823 DETAIL NiPConnect2 SYSTEM CALL connect ERRNO 10061 ERRNO TEXT
 WSAECONNREFUSED: Connection refused COUNTER 1 

I think my host file is wrong???

[Former Member]

For this error, the wiki mentions:

Check if the ECC system exists and the Technical system is configured properly

[Former Member]

What is your message server port ? Is it 3600 or 3601?

Can you give a try with 3601..in the services file.

i.e, sapmsECQ 3601/tcp

[Former Member]

HI ,

Make an entry(X System) in the hostfile of message server(S).

EX:Messaeg Server :S

And JCO s are configures in :X System.

Regards,

Lavanya.G