We recently released a DIXF Application Hotfix for AX 2012 R3 that you may want to take a look at if you are running a Clustered configuration / AlwaysOn configuration:
The changes in the hotfix introduce a new option of “Assume service is on active SQL Server node” on the “Data import/export framework parameters” form.
For further details, see the additional content available on LCS, where you can also download the fix.
LCS | AX 2012 R3 Application Hotfix | KB3216243
This is what the “Data import/export framework parameters” form looks like on a patched environment: