VPN mode (TUN) Issue on Windows v0.3.8

[alexsammers1]

Hey Everybody!

Here's the situation: I'm able to connect via Proxy - no issues, great speed and performance. When I test TUN Mode, it connects successfully, but then has no internet access:

Based on the log, it seems to have an issue with the host domain on my server:

2024/03/02 18:40:34 [Warning] core: Xray 1.8.8 started
2024/03/02 18:40:38 127.0.0.1:61348 accepted //cloudflare-dns.com:443 [http >> proxy]
2024/03/02 18:40:40 127.0.0.1:62747 accepted //rts-us-fcht.freshworksapi.com:443 [http >> proxy]
2024/03/02 18:40:41 127.0.0.1:62748 accepted //play.google.com:443 [http >> proxy]
2024/03/02 18:40:41 127.0.0.1:62749 accepted //mtalk.google.com:5228 [http >> proxy]
2024/03/02 18:40:41 127.0.0.1:62750 accepted //mtalk.google.com:5228 [http >> proxy]
2024/03/02 18:40:42 127.0.0.1:62751 accepted http://cp.cloudflare.com/ [http >> proxy]
2024/03/02 18:40:42 [Warning] [28403595] app/proxyman/outbound: failed to process outbound traffic > proxy/vless/outbound: failed to find an available destination > common/retry: [dial tcp: lookup super.alexsammers.quest: no such host] > common/retry: all retry attempts failed
2024/03/02 18:40:42 127.0.0.1:62752 accepted //rts-us-fcht.freshworksapi.com:443 [http >> proxy]
2024/03/02 18:40:43 [Warning] [2717618132] app/proxyman/outbound: failed to process outbound traffic > proxy/vless/outbound: failed to find an available destination > common/retry: [dial tcp: lookup super.alexsammers.quest: no such host] > common/retry: all retry attempts failed
2024/03/02 18:40:43 127.0.0.1:62753 accepted //play.google.com:443 [http >> proxy]
2024/03/02 18:40:43 127.0.0.1:62754 accepted //play.google.com:443 [http >> proxy]
2024/03/02 18:40:43 127.0.0.1:62755 accepted //google.com:443 [http >> proxy]
2024/03/02 18:40:43 127.0.0.1:62756 accepted //rts-us-fcht.freshworksapi.com:443 [http >> proxy]
2024/03/02 18:40:43 udp:127.0.0.1:58782 accepted udp:8.8.8.8:53 [socks >> proxy]
2024/03/02 18:40:43 udp:127.0.0.1:58795 accepted udp:10.0.68.255:137 [socks >> proxy]
2024/03/02 18:40:43 [Warning] [165079264] app/proxyman/outbound: failed to process outbound traffic > proxy/vless/outbound: failed to find an available destination > common/retry: [dial tcp: lookup super.alexsammers.quest: no such host] > common/retry: all retry attempts failed
2024/03/02 18:40:43 [Warning] [2759660428] app/proxyman/outbound: failed to process outbound traffic > proxy/vless/outbound: failed to find an available destination > common/retry: [dial tcp: lookup super.alexsammers.quest: no such host] > common/retry: all retry attempts failed

Could you please let me know if I'm missing smth here? Happy to provide additional info or re-test, but def need some direction.

[LorenEteval]

If connection is successful in proxy mode then it should also work in TUN mode.

Application log is needed (i.e. Furious Log) to help identify the problem.

[LorenEteval]

Try release 0.3.9

[alexsammers1]

Update - Proxy Mode works perfectly on 0.3.9 - no issues. TUN Mode - same result as before, connects but no internet access.

[2024-03-09 20:22:35,350] [Furious.QtFramework.QtGui] [INFO] action is 'Show Furious Log'. Checked is False
[2024-03-09 20:22:36,590] [Furious.QtFramework.NetworkStateManager] [ERROR] connection test failed. Operation canceled
[2024-03-09 20:22:58,588] [Furious.QtFramework.NetworkStateManager] [ERROR] connection test failed. Operation canceled
[2024-03-09 20:23:40,595] [Furious.QtFramework.NetworkStateManager] [ERROR] connection test failed. Operation canceled
[2024-03-09 20:23:44,581] [Furious.QtFramework.QtGui] [INFO] action is 'Copy'. Checked is False

[LorenEteval]

TUN setup is fine based on your application log. However, connection test via http://cp.cloudflare.com never succeeds.

I can only assume that your server has some firewall rules blocking udp traffic in and/or out, which causes DNS resolution to fail in your case (also shown in your core log).

You can perform further test to verify it (e.g. using curl). In TUN mode:

• All IP-based connections are fine.
• Any connection based on the domain name will fail.

[alexsammers1]

Update - I've checked everything I could think of, no go. For some reason, the TUN Mode always fails to get internet access. I've checked on my PC/VPS, no udp traffic restrictions or block lists.

I've even tested with another XRay Client and the TUN mode works there just fine. It is behind on the xray-core version though, 1.8.3

[LorenEteval]

2024/03/02 18:40:43 [Warning] [165079264] app/proxyman/outbound: failed to process outbound traffic > proxy/vless/outbound: failed to find an available destination > common/retry: [dial tcp: lookup super.alexsammers.quest: no such host] > common/retry: all retry attempts failed

Reproduced this error after switching server address to a domain name. I doubt there's something misconfigured in the default Xray configuration. When I switch server address to domain name under hy2 everything works fine.

Xray-core failed to resolve server address successfully before transmiting everything in TUN mode.

[alexsammers1]

Yep, confirmed - once I changed the domain to Server IP, Tun Mode connected successfully, full internet access.

Thank you for looking into this - really appreciate it!

[hamid3pelh]

I had the same problem, and it was solved by changing the domain to the server IP. Is there anything you can do to make it work with the domain? thanks

[LorenEteval]

This issue needs PR fix.