Recurring RFC connection problems

Hi!
I really need some help. We have been experiencing RFC problems for a few months now and our basis team have no clue as to what the problem might be. The problem is that on a daily basis we experience RFC connection problems. It usually happens at about 7am in the morning and lasts for an hour. After that the problem clears itself and for the rest of the day runs smoothly.
We clearly see this problem on our RFC connection to the IBM MQ message server which handles all our incoming and outgoing IDOCS. This is however not the only RFC problem as we have also had RFC connection failures when switching between instances in SM51. This suggests to us that it is probably not a network issue, although the MQ server is housed in a different data center than the SAP servers.
We are running ECC6 and our environment looks like this:
4 hosts running 5 instances: 3 hosts with one instance and 1 host with 2 instances.
While this problem is occurring you can do a connection test in SM59 to MQ which is usually successful. In SMGW we have picked up that it is trying to establish multiple connections to MQ, some connects successfully and some cannot connect. In ST11 in the RFC trace files the error message says that the MQ connection times out.
While monitoring the MQ server we cannot pick up any problems. The MQ server itself seems to run without errors. The only problem is that it cannot connect to SAP to send IDOCS and SAP cannot connect to MQ. The load on the MQ server while this error occurs is minimal compared to the rest of the day.
Does anyone have any ideas as to what the problem might be? Are there any other places other than the ones mentioned in this mail where we can check for errors?
Thank you in advance!
Iwan

Hi Marcelo,
In SM59, just select the RFC and above in same screen you can see the options
RFC----- Display Trace (Shift + F8)
Check the trace file and see if there is any connection problem between the two system.
Regards,
Ravi

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Hello All,
We are setting up communication between R/3 4.7 and SCM 5.0 system for EWM (Extended warehouse management) with RFC connection and using IDocs to transfer data from one box to another box.
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Hi,
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I want to make a RFC Connection between Production Server & Solution Manager.
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Edited by: varun@pcl on Jul 31, 2010 4:40 PM

Hi
Mention which Client u login and valid username and password from both PROD Server and Solman .
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Hi...
Check the Unicode/Non unicode status in MDMP&UNICODE tab present in transaction SM59 while chking the connection.
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Hi,
Our environment is SRM 5.5 server with 2 R/3 backend systems. One of the R/3 systems is in another country. We happen to have RFC problems during the communication between the SRM and R/3 server.
Below you can find the SM21 log related to an operation on SRM server. What might be the reason for this problem? Does anyone know the solution?
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Details Page 2 Line 26 System Log: Local Analysis of sapsrmt                  1
Time
Type
Nr
Clt
User
TCode
Grp
N
Text
10:24:58
DIA
000
013
EMREK
R4
9
Communication error, CPIC return code 020, SAP return code 223
Communication error, CPIC return code 020, SAP return code 223
Details
Recording at local and central time........................ 07.12.2006 10:24:58
Task......
Process
User......
Terminal
Session
TCode
Program
Cl
Problem cl
Package
91342
Dialog work process No. 000
EMREK
XXXXXXXX
2
K
SAP Web AS Problem
STSK
Further details for this message type
Module nam
Line
Error text
Caller....
Reason/cal
thxxhead
7192
020223
ThRecei
CPIC-Er
Documentation for system log message R4 9 :
A CPIC function has failed. The conversation ID and CPIC function are
specified in the system log entries. Use the conversion ID to find more
detailed information about the error in the system log for the SAP
gateway.
Meaning of the SAP return codes:
1) Gateway errors:
221,,Error in CPIC-SS
222,,Storage bottleneck
223,,Network read error
224,,Network write error
225,,Invalid request
226,,No connection yet
227,,Gateway process terminated
228,,Shared-Memory problem(read)
229,,Shared Memory problem(write)
230,,No free LU
231,,No free gateway process
232,,Error when starting gateway proc.
233,,Incorrect communication type
234,,Connection setup failed
235,,Error in comm. table
236,,No connection to gateway
237,,Connection to gateway closed
238,,Error in GW command (write)
239,,Error in GW comm.   (read)
240,,Invalid length
241,,Invalid environment
242,,Timeout
243,,Error setting up SAP connection
244,,Partner has closed connection
245,,Storage overflow
246,,Incorrect APPC header version
247,,APPC server not started
248,,Error accessing TXCOM
249,,Comm. table is full
630,,Invalid mode no. received
631,,Max.no. of gateways reached
632,,No LU specified
633,,Max.no. of clients reached
634,,Invalid TP name
635,,fork failed
636,,Invalid NI handle
637,,rexec failed
638,,TP start failed
639,,NiDgSend failed
640,,Internal error
664,,Gateway host is unknown
665,,Gateway service unknown
666,,NI error
667,,exec failed
668,,R/2 restarted
669,,Symb. destination too long
670,,No more side-info entries
672 ,,Logon to NetWeaver failed
673 ,,IMS Error Purging
674 ,,Timeout for registered programs
676 ,,TP not registered
677 ,,Timeout for registered programs
678 ,,TP is registered
679 ,,TP is not registered
720 ,,Security breach of registered programs
721 ,,SNC deactivated
722 ,,SNC required
723 ,,SNC name not defined
724 ,,Default SNC name not permitted
725 ,,Protocol does not support SNC
726 ,,No local SAP System
727 ,,SNC required
728 ,,Conversation ID not found
729 ,,SNS must do the communication
730 ,,Start of external programs deactivated
731 ,,Gateway shut down
732 ,,No external programs
733 ,,Conversation ID does not match
734 ,,Net conversation error
735 ,,Monitor is not active
736 ,,Conv-ID is not unique
Errors in the CPIC Interface:
450 ,,No storage
451,,No side-info entry
452,,TP-START failed
453,,No initialization
454,,"getlu" failed
455,,"signal" failed
456,,Timeout during conn. setup
457,,CMALLC failed
458,,CMSEND failed
459,,Prepare-To-Receive failed
460,,"mc_flush" failed
461,,CMRCV failed
462,,Argument missing
463,,"get_allocate" failed
464,,CMDEAL failed
465,,TP-END failed
466,,Max.no.of conv. reached
467,,"snaopen" failed
468,,"snactl" failed
469,,No flush in IBM environment
470,,"snaclse" failed
471,,Status error
472,,No side-info entry
473,,No conversation
474,,Connection closed manually
475,,Connection closed automatically
476,,No partner found
477,,Confirm failed
478,,Confirmed failed
479,,GWHOST not in side-info entry
480,,GWSERV not in side-info e.
481,,PROTOCOL not in side-info entry
482,,LU not in side-info e.
483,,TP not in side-info entry
484,,No conn.to gateway
485,,gethostname failed
486,,SAP_CMACCP not executed
487,,Program not in argument list
488,,Host not in argument list
489,,Service not in argument list
490,,Conv-ID not in argument list
491,,Invalid parameter
492,,LU62CVCT failed
493,,LU62ATTCH failed
494,,No CONV table
495,,Incorrect conv.table
496,,Invalid conv modification
497,,NiHostToAddr failed
498,,NiAddrToHost failed
499,,Read operation tab.THOST failed
500 ,,No side info file exists
501 ,,CMRCV failed
Technical details
File
Offset
RecFm
System log type
Grp
N
variable message data
6
245700
m
Error (Function,Module,Row)
R4
9
020223                                ThReceiCPIC-Erthxxhead7192

Hi,
It will be very difficult to solve without being on the customer site and having all information.
Right now, the error code is network error...
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Hi Friends ,
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Message was edited by:
 ranga rajan

Hi,
Have a look at this.This will help you.
1.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/f3f93ee7-0c01-0010-2593-d7c28b5377c2
2. https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3103eb90-0201-0010-71af-be6f4a6f61d1
Regards,
Akshay Jamgaonkar.
Reward points if find useful.
Message was edited by:
 Akshay Jamgaonkar

Problem with RFC connection - tp program not registered

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Trace file opened at 20101221 130738 Central European Standard Time, SAP-RE
======> CPIC-CALL: 'ThSAPOCMINIT' : cmRc=2 thRc=679
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./rfcexec -a(PROG_ID) -gssapprod -xsapgw21 &
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EntrSist.     Error de conexión
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Det.error     LINE:
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kind rtegards, achim

Recurring RFC connection problems

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