How to manual connect target host for RDP

I use PAM3.0 ( don't connect the
windows2008R2,the error report don't connect target server.but my test
host and target server on the same network,Not any firewall stop the
connection and I excute the mstsc on the test host connect target
host.This is ok.Can tell me how to manual connect target host for RDP. I
want to know what the error have happen.
the RDP port is 13389?I think the test host first connect NPUM manager
host and forward target server.So can tell me how to do connect NPUM
manager and excuted command.

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