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Have You Got Mismatched Host ID's From AX To N4? Here Is How To Fix:

Older Versions Of Niagara 4 And AX Could Sometimes Experience Their Platform HOST-ID Changing After Windows Updates. This Is Due To How Microsoft Now Periodically Roll Their Operating System Build Forward In One Large Update, Rather Than Historically Installing Lots Of Small Patches. Thus Giving Niagara The Impression That The Computer Upon Which It Installed Has Changed.                                                                                                                                                           HOST-ID’s On Niagara Installs Newer Than And Including AX 3.8u2 & 4.3.58.18 Should Remain Static Even After Windows Updates. This Article Is Applicable Only To Versions Older Than These.                                                                                   

Firstly make sure that both AX and N4 are running the same architecture (32 vs 64bit). To check this head to the console of each AX and N4 and type in ‘nre -version’ this will then tell you whether the installation is 32vs64). You will need to ensure that all versions installed are for the same architecture.

Then you can head to this link below and download patches.

https://downloads.innon.com/tridium-niagara-niagara4-download ( You're looking for HOSTID_Patches.zip )

Within file explorer head to the Niagara install folder of the version that is reporting the non-current HOST-ID such as (C:\Niagara\Niagara-*****\bin). Now within the bin folder drop and replace the ‘nre.dll’ file and this will synchronise the licenses to match.

Re-launch Niagara and the HOST-ID should now match the current versions and you will be able to license the install.