yes, impossible to establish communications for ever.
Basicly, the race is _so_ alien, there is simply no common ground to start developing anything similar to a language, like trying to talk to a ants or to a race, that communicates by means, that humans not only can´t use, but also are unable to imitate and possibly not event to think about/notice (smells, colours, mimic,... of course, those are all things _I_ could think of, so it has to be something else
)