Dear @agarger,

When I plugged it in It works fine with proper internet to the devices connecting to it, but internet access to the computer connected directly to the R600 has been lost.

• Ensure the computer is connected to the LAN port of the R600VPN router with a good cable.

By default, Port1 & Port2 are WAN ports while the others are LAN ports. And the port LED would light up if it's plugged in well.

• Try to unplug and plug the computer back to the R600VPN to refresh the connection.

• Check whether the computer can obtain an IP address, default gateway and DNS server from the R600VPN.

You may refer to this guide to check the IP info on the PC, https://www.tp-link.com/support/faq/838/

• If possible, connect a different PC to the LAN port of the R600VPN router for checking.

Dear @agarger,

Unfrotunately now there is a separate problem that the R600 seems to completely throttle the speeds of the connected devices (we are talking 2-3 Mbps) for some reason.  I have tested the cables and they are not the problem (computer connected directly to modem via the same cat 6 cable gets 170 mbps,  wifi router connected directly to modem  via cat 5 is a bit slower) but when either device is connected through the R600, speed plummets.

What's the hardware and current firmware version of your TL-R600VPN router (you can find the info from the STATUS page)?

To eliminate any possible influence of configuration, you may back up the current settings, then factory reset the router for checking.

In addition, if possible, you may try using Iperf to test the speed of the router by referring to the guide below.

https://www.tp-link.com/support/faq/2408/