I tried to use Visual COBOL 2.3 to connect to IBM MQ 7.5 which is installed on the same machine (RHEL 7.2)

The sample code is from IBM MQ 7.5 sample folder and I follow IBM document (instructions) , the sample is also posted online as

www.davar.net/.../amq0put0.cbl

I setup and compile the code as these steps:

export COBCPY=/opt/mqm/inc/cobcpy64

cob64 -xtvP amq0put0.cbl -L /opt/mqm/lib64 -lmqicb_r

Everything is good, create the 64-bit executable:

[cobol@rh7 samp]$  cob64 -xtvP amq0put0.cbl -L /opt/mqm/lib64 -lmqicb_r
cob64 -C nolist -xtvP amq0put0.cbl -L /opt/mqm/lib64 -lmqicb_r
* Micro Focus COBOL                  V2.3 revision 000           Compiler
* Copyright (C) Micro Focus 1984-2015. All rights reserved.
* Accepted - verbose
* Accepted - reentrant
* Accepted - nolist
* Accepted - list("amq0put0.lst")
* Compiling amq0put0.cbl
* Total Messages:     0
* Data:       10608     Code:        1193
* Micro Focus COBOL Code Generator
* Copyright (C) Micro Focus 1984-2015. All rights reserved.
* Accepted - verbose
* Generating amq0put0
* Data:       10376     Code:        1950     Literals:         624
cob64: Entry points defined in module: amq0put0.o
    *AMQ0PUT0
    amq0put0

But when I run it,   I always got this error:

MQCONN ended with reason code 000002058 

2058 Queue Manager name error   --http://www-01.ibm.com/support/docview.wss?uid=swg21166938

In the sample folder, there is also the C code,  and executable from C code: amqsput

I use ./amqsput REQUEST_Q QM1   to test with my local queue and queue manager.  no issue at all.  I can send message to it.

this is how COBOL calls MQ function:

       CALL 'MQCONN'
            USING QM-NAME, HCONN,
            COMPLETION-CODE, CON-REASON.

this is how C code to call MQ:

 MQCONN(QMName,                  /* queue manager                  */
          &Hcon,                   /* connection handle              */
          &CompCode,               /* completion code                */
          &CReason);               /* reason code                    */

I assign the same value for the first parameter in both COBOL and C  (I change original COBOL to accept Queue Manager Name from console)

I do not understand why COBOL code failed,  C code succeeded.  both executed from the same folder.

Really appreciated for the help.

PS -- The IBM instructions for MQ development  has the special part for Micro Focus COBOL.  I just follow it exactly.