- Plesk Onyx
Plesk Firewall installation via Plesk > Advisor > Recommendation fails with the following error:
PLESK_ERROR: Unknown error
After refreshing the page, Plesk Firewall is displayed as installed.
The Firewall is available for managing and further configuring in Plesk > Tools & Settings.
It is bug #PPPM-8680 which will be fixed in the future product updates.
This error does not affect Plesk Firewall installation - it is installed correctly.
Refresh the page after the error appearing in order to close it.