Breaking: #21638 - AbstractUserAuthentication::lockIP property removed 

See forge#21638

Description 

The IP-locking-functionality is extended from IPv4 only to now also support IPv6. A separate IpLocker-functionality was added.

The public property lockIP in \TYPO3\CMS\Core\Authentication\AbstractUserAuthentication is now removed. It usually shouldn't have been accessed directly and supported IPv4 only.

Impact 

Extensions relying on lockIP won't be able to perform their task anymore. This might for example be the case when lockIP was set dynamically, depending on the REMOTE_ADDR.

Affected Installations 

Every 3rd party extension depending on the formerly public lockIP property is affected.

Migration 

Set lockIP and lockIPv6 in TYPO3_CONF_VARS - for FE or BE depending on the use case. Use the new \TYPO3\CMS\Core\Authentication\IpLocker API.