This Article Applies to:
There are cases that customers want to access a local L2TP/IPSec VPN server from an outside network, thus they will be required to open some specific ports on the gateway router, such as port 500, 4500, and 1701.
Typical network layout would be as follows:
However, customers will find they cannot open port 1701 on the Archer C80, it reports an error "Conflicting with existing port: 1701. To avoid conflict, please enter another value.". This is because that the 1701 port is reserved for the L2TP WAN connection on the Archer C80 with the current firmware, and you cannot open it for another server.
We here provide a beta firmware for the Archer C80 to allow you to open 1701 for another server, customers can install it on your C80, then try to open port 1701 for the local L2TP/IPSec VPN server on the router.
Download link (Updated on 2021-11-22):
1. Please be sure you have read the Terms and Conditions for TP-Link Beta Firmware before proceeding!
2. This beta version can be applied to both the EU and US versions.
After installing this beta firmware on the Archer C80, please disable the IPSec Passthrough on the router. You can find it under the Advanced > Security > ALG page:
*This will be optimized in the new official release, please keep an eye on the Tether app or the official website for any new firmware in the future.