Some Plesk operation failed: Error: no secure shell available

Symptoms

• An attempt to perform one of the following operations in Plesk:

  • Create a subscription
  • Change the FTP account password
  • Deploy an application (e.g., WordPress)
  • Settings Permanent SEO-safe 301 redirect from HTTP to HTTPS at Plesk > Domains > example.com > Hosting settings

  The operation fails with the following error:

  PLESK_ERROR: Error: no secure shell available

• File /usr/local/psa/admin/conf/site_isolation_settings.ini is modified and contains pre-defined shell:

  # grep 'shell = ' /usr/local/psa/admin/conf/site_isolation_settings.ini
  shell = /bin/bash

• In the corresponding service plan, Setup of potentially insecure web scripting options that override provider's policy option is disabled.

Cause

Service plan permissions contradicts with /usr/local/psa/admin/conf/site_isolation_settings.ini settings.

Resolution

In order to resolve the issue, either comment out 'shell = ' in /usr/local/psa/admin/conf/site_isolation_settings.ini file with ';' after logging into the server via SSH:

# sed -i.bak 's/shell =/;shell =/' /usr/local/psa/admin/conf/site_isolation_settings.ini

Otherwise, enable the Setup of potentially insecure web scripting options that override provider's policy option is the corresponding service plan or per-subscription and also check that Management of access to the server over SSH match /usr/local/psa/admin/conf/site_isolation_settings.ini definition: