Unable to reach JGS524PE via WireGuard VPN

Hi,

I have a problem with a JGS524PE (FW 2.6.0.48) web GUI that it's not reachable behind a wireguard tunnel.

It's reachable normally without wireguard by any client on the same subnet.

The error using a web browser is: ERR_CONNECTION_REFUSED

The error using curl is the same: curl: (7) Failed to connect to 192.168.21.2 port 80 after 2465 ms: Connection refused

My setup is pretty simple and straightforward:

WAN -> Router -> JGS524PE -> Clients / AP / Other switches

Normal LAN clients subnet: 192.168.21.xxx

Wireguard clients: 10.9.0.xxx

No VLAN

Wireguard endpoint is offered by a client directly attached to JGS524PE

Every other clients is reachable from WAN to LAN and viceversa, even a Netgear GS108Tv3 connected to JGS524PE

Access control doesn't solve the issue, the other switch (GS108Tv3) is working fine even using deafult settings.

Any help?