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VPN Not Working

ASUS Router

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

ASUS Router VPN Not Working — Fix Guide

What Does This Error Mean?

ASUS router VPN failing to connect is most often caused by incorrect credentials, the wrong VPN protocol being selected, or the ISP blocking VPN ports. Double-check the VPN username, password, and server address in the ASUSWRT VPN client settings, and try switching from PPTP to OpenVPN or WireGuard if available.

Affected Models

  • ASUS RT-AX88U
  • ASUS RT-AX86U
  • ASUS RT-AX58U
  • ASUS ZenWiFi AX (XT8)
  • ASUS RT-AC68U

Common Causes

  • Incorrect VPN server address, username, or password
  • ISP is blocking the VPN protocol port (common with PPTP on port 1723)
  • VPN provider has changed server addresses and the configuration is outdated
  • DNS leak causing the VPN tunnel to malfunction

How to Fix It

  1. Log in to the ASUS admin panel and go to VPN > VPN Client. Double-check every field — server address, port, username, and password. Copy-paste credentials from your VPN provider to avoid typos.

    Many VPN providers have changed their server addresses since 2022. Download a fresh configuration file from your VPN provider dashboard.

  2. If using OpenVPN, download a fresh .ovpn configuration file from your VPN provider and import it via VPN > VPN Client > Add profile > Import .ovpn file.

    OpenVPN is more reliable than PPTP on most ISPs. PPTP uses port 1723 which many ISPs throttle or block.

  3. If the router supports WireGuard (firmware 3.0.0.4 or newer on supported models), use it instead. WireGuard is faster and more reliable than OpenVPN on ASUS routers.

  4. After connecting the VPN, test for DNS leaks using dnsleaktest.com. If your real IP appears, go to VPN > VPN Client > Force all clients through the VPN tunnel and enable the DNS filter.

Frequently Asked Questions

Can I route only some devices through the VPN on an ASUS router?

Yes — ASUS ASUSWRT supports split tunneling under VPN > VPN Client > VPN Director. You can route specific devices or IP ranges through the VPN tunnel while other devices use the regular internet connection. This is useful for streaming from abroad on one device without slowing down the rest of the network.