Intercommunication

Error logs

WebSphere MQ error messages are placed in different error logs depending on the platform. There are error logs for:

OS/2 and Windows
UNIX systems
VSE/ESA
DOS, Windows 3.1, Windows 95, and Windows 98 clients
z/OS
MQSeries for Compaq NonStop Kernel

Error logs for OS/2, Windows and Windows 98 client

MQSeries for OS/2 Warp and WebSphere MQ for Windows use a number of error logs to capture messages concerning the operation of WebSphere MQ itself, any queue managers that you start, and error data coming from the channels that are in use.

The location the error logs are stored in depends on whether the queue manager name is known and whether the error is associated with a client.

If the queue manager name is known and the queue manager is available:
```
C:\MQM\QMGRS\QMgrName\ERRORS\AMQERR01.LOG
```

If the queue manager is not available:

C:\MQM\QMGRS\@SYSTEM\ERRORS\AMQERR01.LOG

If an error has occurred with a client application:
```
C:\MQM\ERRORS\AMQERR01.LOG
```

Note:: The above examples assume that you have installed WebSphere MQ on the C: drive and in the MQM directory. On Windows, the default data path is C:\WINNT\Profiles\All Users\Application Data\MQSeries\.

On Windows, you should also examine the Windows application event log for relevant messages.

Error logs on UNIX systems

WebSphere MQ on UNIX systems uses a number of error logs to capture messages concerning the operation of WebSphere MQ itself, any queue managers that you start, and error data coming from the channels that are in use. The location the error logs are stored in depends on whether the queue manager name is known and whether the error is associated with a client.

If the queue manager name is known and the queue manager is available:
```
/var/mqm/qmgrs/QMgrName/errors/AMQERR01.LOG
```

If the queue manager is not available:

/var/mqm/qmgrs/@SYSTEM/errors/AMQERR01.LOG

If an error has occurred with a client application:
```
/var/mqm/errors/AMQERR01.LOG
```

Error logs on DOS, Windows 3.1, and Windows 95 clients

WebSphere MQ clients use two error logs, stored in a location set by the environment variable MQDATA (the default is the root drive of the client).

Error messages:
```
AMQERR01.LOG
```
FFDC messages:
```
AMQERR01.FDC
```

These files are not readable. See the WebSphere MQ Clients book for information about formatting the information.

Error logs on z/OS

If you are not using CICS, error messages are written to:

The z/OS system console
The channel-initiator job log

If you are using the z/OS message processing facility to suppress messages, the console messages may be suppressed. See the WebSphere MQ for z/OS Concepts and Planning Guide for more information.

If you are using CICS, error messages are written to the z/OS system console or the CKMQ extrapartition transient data queue. See theWebSphere MQ for z/OS Concepts and Planning Guide for more information.

Error logs on MQSeries for VSE/ESA

All WebSphere MQ-generated error messages are written to SYSTEM.LOG.

Error logs on MQSeries for Compaq NonStop Kernel

For information about this, see Queue manager configuration file.