Symptoms
SSH/Shell-Access button at Domains > example.com does not work in Plesk Onyx:
Cause
An orphaned package of dropped since Plesk 17.0 extension left installed after an upgrade. The issue is confirmed as Plesk bug with ID PPPM-9970 and going to be fixed in future Plesk updates.
Resolution
Remove the package of extension manually:
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Connect to the server via SSH;
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Execute the following command in order to remove the package:
# rpm -e –nodeps SSHTerm-0.2.2-10
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Refresh information about installed Plesk components:
via CLI:
# plesk sbin packagemng -sdf
via GUI:
go to Plesk > Tools & Settings > Server Components and click Refresh