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Error: error (msg dgw 748 not found)

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Error: error (msg dgw 748 not found)
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EGW 748 not found When executing RFC Connection

We are getting following error when executing RFC Connection:

Error when opening an RFC connection

ERROR: Error (Msg EGW 748 not found)

LOCATION: SAP-Server <server name> on host <hostname> (wp <nr>)
COMPONENT: CPIC
RETURN CODE: 748

The work process trace file (dev_wp<nr>) shows:

*** ERROR => ThIGetT100: msg EGW 748 not found [thxxmode.c   5910]
***LOG R37=> ThIGetT100, sapt100 ( 748) [thxxmode.c   5919]
* CMRC=19 DATA=0 STATUS=0 SAPRC=748 ThSAPOCMINIT
RFC> ABAP Programm: xxxxxx (Transaction: SM59)
RFC> User: <user name>  (Client: <cln>)
RFC> Destination: <RFC_Name> (handle: x, …
*** ERROR => ThIGetT100: msg EGW 748 not found [thxxmode.c   5910]
***LOG R37=> ThIGetT100, sapt100 ( 748) [thxxmode.c   5919]
*** ERROR => RFC ======> CPIC-CALL: 'ThSAPOCMINIT' : cmRc=19 thRc=748

Error (Msg EGW 748 not found)

*** ERROR => RFC Error RFCIO_ERROR_SYSERROR in abrfcpic.c : 1730
CPIC-CALL: 'ThSAPOCMINIT' : cmRc=19 thRc=748
Error (Msg EGW                  748 not found)
DEST =<RFC_Name>
HOST =%%RFCSERVER%%
PROG = <Program ID>
GWHOST =<gw_hostname>
GWSERV =sapgw<nr>

In the Syslog (transaction SM21), you can find: “R3 7 Error in T100, MSG: 748”

Solution:

You should review reginfo file from the Gateway (where the program has been registered):

 "Gateway Options" on the "Technical Settings" tab page in transaction SM59.

  • Gateway Host    <gw_hostname>
  • Gateway service sapgw<nr>

1) If there's a line that will allow the registration “non-explicit for that <Program ID> (TP = *)”, remove it. For instance:

P TP=* HOST=local CANCEL=local ACCESS=local

Reginfo file should be adjusted accordantly, so that first valid line matches registering requirements.

Following line should be LAST one in the reginfo file:

P TP=* HOST=internal,local CANCEL=internal,local ACCESS=internal,local

The keyword "local" refers to localhost and "internal" refers to "hosts belonging to the same system”. See SAP 1809896 for more information.

2) Reload the new rules with the following procedure: SMGW, menu Goto > Expert Functions > External Security > Reload.

3) De-register all the registrations of the involved program (in case it's registered more than once) by SMGW > Goto > Logged on Clients > Delete Client.

4) Re-register the program (so new rules from reginfo file are used for the registration).


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