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This product reached the end of support date on March 31, 2021.

Error: Key Passphrase Agent is not running


Hi All,

When i am running kpadmin command on AMD; i am getting below error. Can someone help me to get out of it please?

@kpa/kpacomm.cpp:104 Fatal error: cannot open FIFO /tmp/kpa_admin_s for writing : No such device or address

@kpa/kpadmin.cpp:256 Communication cannot be established

Error: Key Passphrase Agent is not running.

Also i am unable to run "Service kpa restart" on the server getting command not found.



The service command should be part of every OS installation. Are you sure you type it all lowercase ("service") and not as you mentioned it ("Service")?

Hi - Thanks for your reply. i am running with lower case as well.

service kpa restart
-bash: service: command not found

Also do you have any idea why i am unable to run "kpadmin" command?




Any idea guys on this?

DynaMight Pro
DynaMight Pro
  • What OS+version are you using (32/64)?
  • What AMD version?

  • Are you working on 'root', or using sudo?
  • Did you install in the default location?
  • Did you use the (right) amd.cfg and jumpstart installation?

In case the actual binary and associated files for /sbin/service are not
installed in the system, then you might be able to install
the following package via yum

$ sudo yum install -y system-config-services

Hi Frans - This is old set up and was working few days ago. Now suddenly when i was trying to load certificate; i got above error while running "kpadmin" command. Any idea come across about the fix in this situation would appreciated.

Thanks - Kapil

Dynatrace Pro
Dynatrace Pro

Did you open a ticket to the dynatrace support?



Support is expired

DynaMight Pro
DynaMight Pro

Kapil, I actually suspect that you may have an error on your disk or a filesytem got corrupted.

You may have to do filesystem check first. See this article:

And do as Jean-Louis suggested, open a support case at DT.

Support is expired


Issue is now resolved. Finally i was able to run "service kpa start" command successfully. kpa agent is now up and i can run kpadmin command though. Thanks for all your support guys.

I am curious what solved it.

Hi Frans - sudo /sbin/service kpa start this command works fine and kpa engine started

Dynatrace Guide
Dynatrace Guide


I have the same issue in RedHat 7.3

The actual command to restart it with systemctl is as follows :

# systemctl restart kpa.service

After restarting, it works fine again ...

Digging deeper for the origin of this issue [it happens often on multiple servers], I found that OS system cleanup is removing required FIFO files from the /tmp directory

I'll create a support ticket to suppress system/tmp cleanup for these files, or to have their location changed.

just add :

x /tmp/kpa_*

to /usr/lib/tmpfiles.d/dynatrace-amd.conf