Unable to connect to VPN - Failed to connect ESP tunnel; using HTTPS instead.

[saipavanc]

Describe the bug
I am able to finish the SAML authentication, application says its connected, but I am unable to access the internet.

Expected behavior
Connect to vpn with a working internet connection.

Logs

$ gpauth vpn-connect.northwestern.edu --browser default 2>/dev/null | sudo gpclient connect vpn-connect.northwestern.edu --cookie-on-stdin
[sudo] password for <user>: 
[2024-12-09T18:26:30Z INFO  gpclient::cli] gpclient started: 2.3.9 (2024-12-09)
[2024-12-09T18:26:30Z INFO  gpapi::portal::prelogin] Portal prelogin with user_agent: PAN GlobalProtect
[2024-12-09T18:26:30Z INFO  gpapi::portal::prelogin] Perform prelogin, user_agent: PAN GlobalProtect
[2024-12-09T18:26:30Z INFO  gpclient::connect] Reading cookie from standard input
[2024-12-09T18:26:41Z INFO  gpapi::portal::config] Retrieve the portal config, user_agent: PAN GlobalProtect
[2024-12-09T18:26:41Z INFO  gpapi::gateway::parse_gateways] Try to parse the external gateways...
[2024-12-09T18:26:41Z INFO  gpclient::connect] Connecting to the only available gateway: vpn-connect2-nit (vpn-connect2.northwestern.edu)
[2024-12-09T18:26:41Z INFO  gpapi::gateway::login] Perform gateway login, user_agent: PAN GlobalProtect
[2024-12-09T18:26:41Z INFO  openconnect::ffi] openconnect version: v9.12
[2024-12-09T18:26:41Z INFO  openconnect::ffi] User agent: PAN GlobalProtect
[2024-12-09T18:26:41Z INFO  openconnect::ffi] VPNC script: /etc/vpnc/vpnc-script
[2024-12-09T18:26:41Z INFO  openconnect::ffi] OS: linux
[2024-12-09T18:26:41Z INFO  openconnect::ffi] CSD_USER: 1000
[2024-12-09T18:26:41Z INFO  openconnect::ffi] CSD_WRAPPER: (null)
[2024-12-09T18:26:41Z INFO  openconnect::ffi] RECONNECT_TIMEOUT: 300
[2024-12-09T18:26:41Z INFO  openconnect::ffi] MTU: 0
[2024-12-09T18:26:41Z INFO  openconnect::ffi] DISABLE_IPV6: 0
[2024-12-09T18:26:41Z INFO  openconnect::ffi] NO_DTLS: 0
[2024-12-09T18:26:41Z INFO  openconnect::ffi] POST https://vpn-connect2.northwestern.edu/ssl-vpn/getconfig.esp
[2024-12-09T18:26:41Z INFO  openconnect::ffi] Connected to 129.105.179.53:443
[2024-12-09T18:26:41Z INFO  openconnect::ffi] SSL negotiation with vpn-connect2.northwestern.edu
[2024-12-09T18:26:41Z INFO  openconnect::ffi] Connected to HTTPS on vpn-connect2.northwestern.edu with ciphersuite (TLS1.2)-(ECDHE-SECP256R1)-(RSA-SHA256)-(AES-256-GCM)
[2024-12-09T18:26:42Z INFO  openconnect::ffi] Tunnel timeout (rekey interval) is 180 minutes.
[2024-12-09T18:26:42Z INFO  openconnect::ffi] Idle timeout is 180 minutes.
[2024-12-09T18:26:42Z WARN  openconnect::ffi] GlobalProtect IPv6 support is experimental. Please report results to <[email protected]>.
[2024-12-09T18:26:42Z WARN  openconnect::ffi] No MTU received. Calculated 1422 for ESP tunnel
[2024-12-09T18:26:42Z INFO  openconnect::ffi] POST https://vpn-connect2.northwestern.edu/ssl-vpn/hipreportcheck.esp
[2024-12-09T18:26:42Z WARN  openconnect::ffi] WARNING: Server asked us to submit HIP report with md5sum f0ee7dfd6789636cf03d39b63349595a.
        VPN connectivity may be disabled or limited without HIP report submission.
        You need to provide a --csd-wrapper argument with the HIP report submission script.
[2024-12-09T18:26:47Z WARN  openconnect::ffi] Failed to connect ESP tunnel; using HTTPS instead.
[2024-12-09T18:26:48Z INFO  openconnect::ffi] Using vhost-net for tun acceleration, ring size 32
[2024-12-09T18:26:48Z INFO  openconnect::vpn] Connected to VPN, pipe_fd: 11
[2024-12-09T18:26:48Z INFO  gpclient::connect] Wrote PID 126285 to /var/run/gpclient.lock
^C[2024-12-09T18:27:03Z INFO  gpclient::connect] Received the interrupt signal, disconnecting...
[2024-12-09T18:27:03Z INFO  openconnect::ffi] Stopping VPN connection: 11
[2024-12-09T18:27:03Z INFO  openconnect::ffi] POST https://vpn-connect2.northwestern.edu/ssl-vpn/logout.esp
[2024-12-09T18:27:03Z INFO  openconnect::ffi] SSL negotiation with vpn-connect2.northwestern.edu
[2024-12-09T18:27:03Z INFO  openconnect::ffi] Connected to HTTPS on vpn-connect2.northwestern.edu with ciphersuite (TLS1.2)-(ECDHE-SECP256R1)-(RSA-SHA256)-(AES-256-GCM)
[2024-12-09T18:27:03Z INFO  openconnect::ffi] Logout successful.
RTNETLINK answers: No such process
[2024-12-09T18:27:03Z INFO  openconnect::ffi] openconnect_mainloop returned -4, exiting
[2024-12-09T18:27:03Z INFO  gpclient::connect] Removing PID file

Environment:

• OS: EndeavourOS Linux
• Desktop Environment: KDE X11
• Output of ps aux | grep 'gnome-keyring\|kwalletd5' | grep -v grep: [Required for secure store error]
• Is remote SSH? No

Additional context
I have also tried the older version globalprotect-openconnect package on AUR, and I am getting the same error Failed to connect ESP tunnel; using HTTPS instead..

Am I using the wrong command to initialize? Thank you for the help.

[hsai1020]

I had the same error and this issue was relevant:
#364
We need --disable-ipv6 in the options.