Solana Validator Not Opening RPC Port 8899

I’m running a Solana validator on my server and trying to open RPC port 8899 using the following configuration in my systemd service:

–rpc-bind-address 0.0.0.0
–rpc-port 8899
–private-rpc
–full-rpc-api

The issue is that port 8899 is not opening and is inaccessible (both externally and locally). Here are the details:
    •    Firewall is not active (ufw status confirms it’s disabled).
    •    Port 8899 is not used by any other application (netstat and lsof confirm this).
    •    Validator runs without errors according to the logs.
    •    I’ve tried different RPC ports and –rpc-bind-address parameters without success.
    •    The server has sufficient resources, and RPC options are configured as per the Solana documentation.

Server Details:
    •    Operating System: Ubuntu 22.04.5 LTS (Jammy Jellyfish)
    •    Kernel Version: 5.15.0-130-generic
    •    Motherboard: ASRockRack B650D4U, UEFI version 20.01 (dated 06/20/2024)
    •    CPU: AMD Ryzen 9 9950X, 16 cores, 32 threads, base clock 3.0 GHz, max boost 4.3 GHz, L3 cache 64 MB
    •    RAM: 92 GiB total, ~2% used
    •    Storage:
    •    1 x NVMe SSD Crucial CT4000P3PSSD8 (3.64 TiB, temp: 27.9 °C)
    •    1 x USB drive PNY USB 2.0 FD (28.85 GiB)
    •    Network Interfaces:
    •    Intel I210 Gigabit Network (up, 1000 Mbps, full duplex)
    •    2 additional interfaces (down)
    •    Graphics: ASPEED Graphics Family (server is headless, no display server)
    •    Audio Devices: Integrated AMD audio, ALSA active
    •    Swap: 3.73 GiB (0.5% used)

Does anyone have an idea what might be causing this issue or what else I can check?

Thanks in advance!