Article ID: 128136, created on Jan 23, 2016, last review on Jan 23, 2016

  • Applies to:
  • Plesk Automation 11.5


  1. On attempt to add service node task failed with the following error message:

    Unable to authenticate at the host ''. To resolve this issue, please follow the instructions at
  2. Instructions from the article mentioned in the error message did not help.


This issue caused by incorrect permissions for the /opt/psa_agent/internal/auth. Most probably permissions were set incorrectly in result of umask settings.


  1. Check permissions on the /opt/psa_agent/internal/auth:

    # ls -la /opt/psa_agent/internal/auth
    -rw-r----- 1 root root   48 Jan 22 19:38 /opt/psa_agent/internal/auth
  2. Set correct permissions for the /opt/psa_agent/internal/auth:

    # chmod 644 /opt/psa_agent/internal/auth
    # ls -la /opt/psa_agent/internal/auth
    -rw-r--r-- 1 root root 48 Jan 22 19:43 /opt/psa_agent/internal/auth
  3. Specify default setting for umask in the /root/.bashrc or /etc/bashrc files.

Search Words

Unable to authenticate at the host

33a70544d00d562bbc5b17762c4ed2b3 caea8340e2d186a540518d08602aa065 e0aff7830fa22f92062ee4db78133079

Email subscription for changes to this article
Save as PDF