@Lindaawilsoon If you are using IPsec VPN, please confirm both routers use the same encrypted option. If the router is behind other router, you need to set port forwarding on other router.

@eTomcat As I knew, TP-Link switch doesn't support copprt SFP module. So you may need to change the switch if you must use copper SFP. And I think they should consider to support SFP module since...

@mariem56 TP-Link managed switch can handle the setup of STP and LACP. Please note, after setting LACP, you need to config layer2 feature for LAG group through LAGS Tab. For example, if you want to...

@raytravel If you mean port forwarding, it's called virtual server on TP-Link router.

@TeeCee Of cource you can set up LAN to LAN VPN and Client to LAN VPN at the same time. But your current firmware version seemly have the conflict issue. Suggest to connect TP-Link Support for help....

@curved_horizon Check the negotiated speed for your wireless client and the port speed of TL-SG108PE. Make sure that they have negotiated to the max speed.