How to Resolve NPrinting Messenger Service Not Running and Not Starting

Description of the Problem:

• NPrinting is down and cannot normally start the NPrinting Messaging service and
• Subsequently the NP Scheduler service fails to start as well.
• This results in most NPrinting systems from operating as expected including report distribution and previewing.

Applicable Environments: 

• September 2018 SR 2 and older versions only.

What has caused this problem?

• Corruption has occurred in NPrinting related database files, perhaps as a result of an overly aggressive antivirus software. See Qlik NPrinting Server and Designer Anti Virus Folder Exclusions

• C:\ProgramData\NPrinting\RabbitMQ\db\rabbit@&computername%-mnesia

• Using an Administrator Command Prompt, navigate to C:\Program Files\NPrintingServer\rabbitmq_server-3.x.x\sbin 

• Type rabbitmq-server.bat start
• This may prompt the server startup and exit with a failure with messages such as “not_a_dets_file” or “not a dets file” referring to files in C:\ProgramData\NPrinting\RabbitMQ\db\

• 1. Stop all NPrinting services then navigate to C:\ProgramData\NPrinting\RabbitMQ\db\
• 2. Rename the folder:  rabbit@&computername% to rabbit@&computername%.old

• 3. Go to the Windows 'Services' panel and start all NPrinting services. Notice that a new db subfolder is generated
• 4. Open a command prompt and navigate to C:\Program Files\NPrintingServer\rabbitmq_server-3.5.7\sbin (determine the exact path as per the 'Diagnosis' section of this article)
• 5. Then type into this command prompt:  rabbitmqctl.bat list_permissions
• 6. If it is working normally, you will see:
•