Hi @StPaul TL-SM321A-2 and TL-SM321B-2 should be able to work with any 9/125 μm Single-Mode Fiber with LC interface. TP-Link does not sell the fiber/cable.

Hi @aoalmeida Thank you for your valued feedback! This has been forwarded to the developer team for further evaluation.

Hi @Joblond When set up as a VPN server, each WAN port can connect with up to 10 VPN clients. Could you please check your server settings->VPN IP pool, make sure it has a enough IP range? For example:

Hi @Pascal We are doing research on port forwarding issue in standalone mode. I found you already tried to contact our support. I talked with the engineer (who handled your case), and I can confirm...

Hi @Groucho71 ER605 V1 supports 64 Virtual Server / Port Forwarding in standalone mode; 32 in Controller mode.

Hi @TReimann What is the WAN IP address of your ER8411? Is that a public IP, or just a private IP? This issue could be a result of double NAT.