Unable to remove IP address from Plesk: Cannot remove the IP address because it is the last IP address present on a network interface – Plesk Help Center

Applicable to:

Unable to remove an either IPv4 or IPv6 address from Plesk > Tools & Settings > IP Addresses with error:

PLESK_ERROR: Cannot remove the IP address 2001:db8:f61:a1ff:0:0:0:80 because it is the last IP address present on a network interface.
No websites are assigned on the IP address from the error.

This is an internal issue with ID PPPM-3818, which is planned to be fixed in future product updates.

Use one of the following workarounds:

Workaround A. Hide the IP address from Plesk UI (click to expand the solution listing)

Log into Plesk.
Make sure that there is no subscriptions or reseller accounts assigned to this IP address in Plesk > Tools & Settings > IP Addresses (both Resellers and Sites values should be 0).
Connect to the server via SSH or RDP.
Open /usr/local/psa/admin/conf/panel.ini on Linux or %plesk_dir%\admin\conf\panel.ini on Windows and add the following line:

CONFIG_TEXT: [ip]blacklist="IP_addresses_to_be_hidden"
Open Tools & Settings > IP Addresses and click Reread IP button:

Note: Hiding an IP address already assigned to one or more subscriptions will result in the The IP address is already used for hosting error. The IP address will be marked as blacklisted in Tools & Settings > IP Addresses , but will be available in the Plesk interface.

Workaround B. Remove the IP from network interface by means of an operating system (click to expand the solution listing)

Log into Plesk and make sure that there is no subscriptions or reseller accounts assigned to this IP address in Plesk > Tools & Settings > IP Addresses (both Resellers and Sites values should be 0).
Remove IP address manually from network interface by means of the operating system installed on the server.

Note: Before removing an IP address double check that there is no websites assigned to this IP address in Plesk. If IP address is not in use, in Plesk > Tools & Settings > IP Addresses values "Resellers" and "Sites" of this IP address will be "0".
Open Plesk > Tools & Settings > IP Addresses and click Reread IP button:
Select IP address that needs to be removed (it will be marked as broken ) and click Remove button: