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FTPS and Duel Nat

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We currently have the following setup, and it works

Router --> TMG --> IIS Server

The TMG server has a 3 NIC's (External, DMZ and Internal) and the IIS server is on the DMZ.  All works fine.

Problem is we are moving to a new setup and im having problems getting FTPS to work.

Cisco PIX ----> TMG ----> IIS Server

In this method we are using the PIX to do NAT translation from external IP's to internal and then pass traffic to TMG and that passes it to IIS.  Cant get it to work, no block errors in TMG logs either, from the TMG server i can connect to the FTPS server with a client directly so i know it works, the PIX dont seem to be blocking either, on the IIS side i have tried the firewall address as the external IP and the NAT address also but neither work, it dont seem to be hitting the IIS server, any ideas ?

Thanks


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