Just confirmed!
NAT Router was dropp CONTROL Connection Port when they expires. This NAT Router just closed unused opened NAT Port for security reason. It gives each opened NAT Port a time to remain open, when time expires and not activity on that port then, this NAT Router closed it.
Keep in mind that not all NAT Router work as the same way. My early NAT Router was WinRoute and i don´t notice this behaivor.
I just set it up to a more bigger time (30 minutes), and all FXP session were finished correctly.
So take care about it.
If you get something like us, then suspect if in the middle there´s a device that blocking or closgin opened ports.
Hope this solve your troubles also.
cmf.
Keep good work going on...
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