Remote cracking with ocl via ubuntu server

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Am trying to launch oclhashcat remotely on my Ubuntu server.

Locally everything is working just fine.

While launching ocl remotely I obtain the following messages:

oclHashcat v1.21 starting...

Generating bitmap tables...No protocol specified
No protocol specified


ERROR: clGetDeviceIDs() -1

Need help in making the whole thing work remotely.

Thanks