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I am a novice and need help. I installed a TL-ER5120 and have successfully connected to modems. The router connects to another router that is the gateway for our small network. Outgoing connections for internet and sending email work fine. The problem is that our Exchange server sits behind the two routers. How do I configure the TL-ER5120 to allow Exchange to operate. I also lost the ability to connect with RDP. How to enable this once again.

Thanks in advance,

RS