Well, this is an effort to cut down time on troubleshooting the JCO connections in Netweaver Enterprise Portal 2004s

Following are the common errors observed and solution to them are provided.


1)

 Error: 
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=ptgsap10 GROUP=SPACE R3NAME=EC6 MSSERV=sapmsEC6 PCS=1 LOCATION CPIC (TCP/IP) on local host with Unicode ERROR partner '192.x.x.x:sapmsEC6' not reached TIME Fri Sep 19 14:21:52 2008 RELEASE 700 COMPONENT NI (network interface) VERSION 38 RC -10 MODULE nixxi.cpp LINE 2770 DETAIL NiPConnect2 SYSTEM CALL connect ERRNO 10061 ERRNO TEXT WSAECONNREFUSED: Connection refused COUNTER 1
Solution :
Check if the ECC system exists and also check whether Technical system is configured properly. 


2) 

Error:
 com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=sapde600 GROUP=PUBLIC R3NAME=DE6 MSSERV=sapmsDE6 PCS=1 ERROR service 'sapmsDE6' unknown TIME Fri Sep 19 08:44:13 2008 RELEASE 700 COMPONENT NI (network interface) VERSION 38 RC -3 MODULE nixxhsl.cpp LINE 776 DETAIL NiHsLGetServNo: service name cached as unknown COUNTER 1

or 

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connection parameters: TYPE=B DEST=<Java Rfc client> MSHOST=recc-puc2 R3NAME=REP GROUP=PUBLIC PCS=1 ERROR partner '172.x.x.x:sapmsREP' not reached TIME Fri Aug 16 10:49:55 2013 RELEASE 720 COMPONENT NI (network interface) VERSION 40 RC -10 MODULE nixxi.cpp LINE 3284 DETAIL NiPConnect2: 172.16.36.181:3690 SYSTEM CALL connect ERRNO 239 ERRNO TEXT Connection refused COUNTER 1



Solution :

On the portal server in services file, add the following entry.

sapmsDE6    3600/tcp     # SAP System Messaging Service Port.

Note:  DE6 = SID of the Portal.

For Windows:

Path: Drive/system32/drivers/etc/

For Unix.

path :  root/etc/services




3)

Error:  
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=qashost GROUP=ABC R3NAME=QAS MSSERV=sapmsQAS PCS=1 ERROR Group ABC not found TIME Fri Sep 19 14:30:18 2008 RELEASE 700 COMPONENT LG VERSION 5 RC -6 MODULE lgxx.c LINE 4298 DETAIL LgIGroupX COUNTER 1

Solution :

Check the LOGON Group .

Procedure: 
 
Login to the backend system.
Go to the transaction SMLG and check the Logon Group.

Login to the SLD via http://FQDN:portnumber/sld
 
Choose the Technical system and choose the message server and add the logon group there.
Come back to the JCO that you want to test and select the same logon group here as well.
Test the JCO.


4)

Error:  
 
com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: User XXX USER has no RFC authorization for function group SYST
Solution :

Add the correct client number while testing/configuring the JCO.
Check the authorizations for XXX USER.


5)

Error:  
 
com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: Name or password is incorrect (repeat logon)

Solution :

Check the User Name and Password defined .


6)

Error:   
com.sap.mw.jco.JCO$Exception: (103) RFC_ERROR_LOGON_FAILURE: User J2EE_ADMIN has no RFC authorization for function group SYST.
Solution :

Used Method might have to be chosen as Logon ticket
Change to user id/password, it will get resolved.


7)

Error: 
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to enrich connection properties
Solution :

If you are using the used method as X.509 certificate.
Change the used method to either Logon ticket or user/password



8)

Error:  
 
com.sap.tc.webdynpro.services.exceptions.TypeNotFoundException: type com.sap.tut.wd.flightbooking.model.types.S_Reserv could not be loaded: com.sap.dictionary.runtime.DdException: Type com.sap.tut.wd.flightbooking.model.types.S_Reserv does not exist
Solution :

Re-start your J2EE server or Re-import the model.