# Troubleshooting Zowe Application Framework

The following topics contain information that can help you troubleshoot problems when you encounter unexpected behavior installing and using Zowe™ Application Framework which includes the Zowe Desktop.

Most of the solutions below identify issues by referring to the Zowe logs. To identify and resolve issues, you should be familiar with their names and locations.

The Zowe Application Framework manages issues in GitHub. When you troubleshoot a problem, you can check whether a GitHub issue (open or closed) that covers the problem already exists. For a list of issues, see the zlux repo.

# Desktop apps fail to load


When you open apps in the Zowe desktop, a page is displayed with the message "The plugin failed to load."


This problem might occur when you use Node.js v8.16.1, which performs auto-encoding in a way that breaks Zowe apps. See https://github.com/ibmruntimes/node/issues/142 for details.

To solve the problem, use a different version of Node.js v8, such as v8.17.0, or use Node.js v12. You can obtain them from the Node.js marketplace. Download the ibm-trial-node-v8.17.0-os390-s390x.pax.Z file.

# NODEJSAPP disables immediately


You receive the message CEE5207E The signal SIGABRT was received in stderr.


You might have reached the limit for shared message queues on your LPAR. When Node.js applications are terminated by a SIGKILL signal, shared message queues might not be deallocated. For more information, see the If the NODEJSAPP disables immediately section in the Troubleshooting Node.js applications topic on IBM Knowledge Center.

# Cannot log in to the Zowe Desktop


When you attempt to log in to the Zowe Desktop, you receive the following error message that is displayed beneath the Username and Password fields.

Authentication failed for 1 types:  Types: ["zss"]


For the Zowe Desktop to work, the node server that runs under the ZWESVSTC started task must be able to make cross memory calls to the ZWESIS01 load module running under the ZWESISTC started task. If this communication fails, you see the authentication error.

There are two known problems that might cause this error. The Zowe architecture diagram shows a path from the Zowe Desktop ZLUX server to the zssServer (across the default port 8542) which then connects to the ZWESIS01 started task using cross memory communication. One of those two connections (ZLUX to zssServer, or zssServer to X-MEM) likely failed.

# ZSS server unable to communicate with X-MEM

  1. Open the log file $INSTANCE_DIR/logs/zssServer-yyyy-mm-dd-hh-ss.log. This file is created each time ZWESVSTC is started and only the last five files are kept.

  2. Look for the message that starts with ZIS status.

    • If the communication works, the message includes Ok. For example:

      ZIS status - Ok (name='ZWESIS_STD      ', cmsRC=0, description='Ok'

      If the communication works, the problem is likely that the ZLUX server is unable to communicate to the zssServer. For more information, see ZLUX unable to communicate with zssServer.

    • If the communication is not working, the message includes Failure. For example:

      ZIS status - Failure (name='ZWESIS_STD      ', cmsRC=39, description='Cross-memory call ABENDed'

      In this case, check that the ZWESISTC started task is running. If not, start it. Also, search the log for problems, such as statements indicating that the server was unable to find the load module.

    • If the problem cannot be easily fixed (such as the ZWESISTC task not running), then it is likely that the cross memory server setup and configuration did not complete successfully. To set up and configure the cross memory server, follow steps as described in the topic Installing and configuring the Zowe cross memory server (ZWESISTC).

    • If there is an authorization problem, the message might include Permission Denied. For example:

      ZIS status - Failure (name='ZWESIS_STD      ', cmsRC=33, description='Permission denied'

      Check that the user ID of the ZWESVSTC started task is authorized to access the load module. Only authorized code can call ZWESIS01 because it is an APF-authorized load module.

      Note: If you are using RACF security manager, a common reason for seeing Permission Denied is that the user running the started task ZWESVSTC (typically ZWESVUSR) does not have READ access to the FACILITY class ZWES.IS.

    If the message includes the following text, the configuration of the Application Framework server may be incomplete:

    ZIS status - Failure read failed ret code 1121 reason 0x76650446

    If you are using AT/TLS, then the "attls" : true statement might be missing from the zluxserver.json file. For more information, see Configuring Zowe App Server for HTTPS communication with ZSS.

# ZLUX unable to communicate with zssServer

On the Zowe architecture diagram, there is a communication between ZLUX which is a Node.js runtime serving the Zowe desktop web pages to the user's browser, and the zssServer running on port 8542. If this communication is failing, then you will be unable to log in to the desktop.

Follow these steps:

  1. Open the log file $INSTANCE_DIR/logs/appServer-yyyy-mm-dd-hh-ss.log. This file is created each time ZWESVSTC is started and only the last five files are kept.

  2. Look for the message that starts with GetAddrInfoReqWrap.onlookup and the log messages below.

    yyyy-mm-dd hh:mm:ss.ms <ZWED:16842977> ZWESVUSR INFO (_zsf.apiml,apiml.
    yyyy-mm-dd hh:mm:ss.ms <ZWED:16842977> ZWESVUSR INFO (_zsf.auth,webauth
    yyyy-mm-dd hh:mm:ss.ms <ZWED:16842977> ZWESVUSR WARN (_zsf.proxy,proxy.
      at GetAddrInfoReqWrap.onlookup Ýas oncomplete¨ (dns.js:64:26) {    
      errno: 'ENOTFOUND',                                                  
      code: 'ENOTFOUND',                                                    
      syscall: 'getaddrinfo',                                              
      hostname: 'localhost'                                                    
  3. Map localhost to port

    Create an entry in the file /etc/hosts that contains the line       localhost
  4. Restart the ZWESVSTC address space.

# Server startup problem ret=1115

Symptom: When ZWESVSTC is restarted, the following message is returned in the output of the ZSS server log file, $INSTANCE_DIR/logs/zssServer-yyyy-mm-dd-hh-ss.log:

server startup problem ret=1115

Solution: This message means that some other process is already listening on port 7542, either at address (localhost) or at (all addresses). This prevents the ZSS server from starting.

One possibility is that a previously running ZSS server did not shut down correctly, and either the operating system has not released the socket after the ZSS server shut down, or the ZSS server is still running.

# Application plug-in not in Zowe Desktop

An application plug-in is not appearing in the Zowe Desktop.

To check whether the plug-in loaded successfully, enter the following URL in a browser to display all successfully loaded Zowe plug-ins:


You can also search the node server logs for the plug-in identifier, for example org.zowe.sample.app. If the plug-in loaded successfully, you will find the following message:

[2019-08-06 13:54:21.341 _zsf.bootstrap INFO] - Plugin org.zowe.sampleapp at path=zlux\org.zowe.sampleapp loaded.

If the plug-in did not load successfully, you will find the following message:

[2019-08-06 13:54:21.208 _zsf.bootstrap WARNING] - Error: org.zowe.sampleapp 

If the identifier is not in the logs, make sure the plug-in's locator file is in the /zlux-app-server/deploy/instance/ZLUX/plugins/ directory. The plug-in locator is a .json file, usually with same name as the identifier, for example org.zowe.sampleapp.json. Open the file and make sure that the path that is defined with the pluginLocation attribute is correct. If the path is relative, make sure it is relative to the zlux-app-server/bin directory.

For more information on loading plug-ins to the Desktop, see Adding Your App to the Desktop.

# Error: You must specify MVD_DESKTOP_DIR in your environment


A plug-in that is built in your local environment using npm run start or npm run build failed with an error message about a missing MVD_DESKTOP_DIR environment variable.

Add the Zowe Desktop directory path to the MVD_DESKTOP_DIR environment variable. To specify the path, run the following commands in your Windows console or Linux bash shell:

  • Windows

    export MVD_DESKTOP_DIR=<zlux-root-dir>/zlux-app-manager/virtual-desktop
  • Mac Os/Linux

    set MVD_DESKTOP_DIR=<zlux-root-dir>/zlux-app-manager/virtual-desktop

# Error: Problem making eureka request { Error: connect ECONNREFUSED }


The Zowe started task ZWESVSTC log contains error messages reporting problems connecting

Problem making eureka request { Error: connect ECONNREFUSED
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1195:14)
syscall: 'connect',
address: '',
port: 7553 }

You can ignore these messages. These messages are timing-related where different Eureka servers come up, try to connect to each other, and warn that the endpoint they are trying to perform a handshake with is not available. When all of the Eurka services have started, these errors will stop being logged.