I am trying to render via command line on a remote host using:
mantra -f test.ifd

I receive the following error:

mantra: Mantra tile imager open failure: Tiled Image File: 1 file(s)
mantra: Could not open imager

Any thoughts on what might be causing this?

Thanks.

mantra -f test.ifd local_image.exr ?

I've had that error in the past when Mantra was unable to write to a given location.

Either the destination image path was invalid, or there was a permissions error.