@Charitha Try to configure WAN/LAN2 as a LAN port? On ER605 add a new VLAN interface that is on Cooperate Network, so it can communicate with Firewall. But it may require you add routing rule on the...

@jjasper See answer here: https://community.tp-link.com/en/business/forum/topic/577364

@orfenegro Two things you can try: 1. Try to re-config the VLAN settings. The "LAG port" may not work with VLAN that configured before; 2. Try Balance XOR option on the NAS

@amolinari What is the firmware version of your router? Tplink said they've fixed the issue on v1.2.2, but it's just a beta. ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware...

@HLW103 Two things you may need to concern. 1. The link speed between EAP and the uplink switch. You may check it on the controller Devices->Choose EAP->Right menu. It should be 1000Mbps. 2. Disable...

@steve_togo It seems your mail server settings is not working. (on Settings->Controller option) Maybe the SMTP server is wrong? Try " Test SMTP Server” option to see if it can work.