WebUI unaccessible after Phase 1 configuration

[philibobby]

Hi all,

I am setuping an IPSec VPN site to site tunnel with pfSense 2.4.2-p1. The issue is with my instance running in an AWS VPC.

Setup
I have an EC2 instance with a WAN and LAN interface. They are both in their respective subnets. The public subnet allows connections to port 80, 443, 1194, 22. The private subnet allows all connections. The WAN interface is associated to an Elastic IP.

Problem
After launching the pfSense AMI (https://aws.amazon.com/marketplace/pp/B076TCMRWJ/ref=_ptnr_www_pfs_home), I am able to add the WAN and LAN interface through the WebUI by accessing it from the Elastic IP I associated to the WAN interface.
The moment I go on with configuring the phase 1 of the VPN tunnel, the webUI is no more accessible.

Does anyone have an idea what might be my problem?

Thanks a lot!