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Description of problem:


DisallowTCP=false d'not effect
With option X server start without nolisten, but X apps from remoute mashine not run, the messages " Can not open display "

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Two things to check:

1) that you have properly moved your xauth cookie over (it's in the XAUTHORITY environment variable)
2) that your firewall is open enough to allow it through.