Xinet version 2021.2 does not have a matching Portal version. This article contains information about versions of Portal to use with Xinet 2021.2.
Portal 2021.2 version was skipped as Server 2021.2 was only released to address a Samba (SMB) issue. However, Server 2021.2 is fully supported with Portal 2021.1.
Portal and Server versions 2021.3 have been released since containing several bug fixes. Upgrade to these or later versions if available to take full advantage of the fixes.