Bulk Import 504 Gateway Time-out

I’ve added another security group for integration in my WordPress install so that now I have both Subscribers and Editors in WP.

Running the Bulk Import script results in a 504 Gateway Time-out message in my browser.

The users do still appear to be created in the appropriate groups (though I’m not sure if they are all complete, as I don’t manage the active directory groups myself).

I’ve increased the PHP max_execution_time and max_input_time a few times, but it still shows 504 Gateway Time-out before the specified time.

Test tool using the same bulk import user succeeds without error.

Can you advise?

Thanks.

(I’m running WP 4.3 and ADI v. 1.1.8)

https://www.ads-software.com/plugins/active-directory-integration/