Matching client config not found

[BenIVG]

Describe the bug
I'm trying to connect to a GP portal server, but after the connection is established I get the "WARN Matching client config not found" and the connection is closed. This happens via UI and CLI.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Logs

• GUI

[2025-08-21T07:00:38Z INFO  openconnect::ffi] POST https://[**********]/ssl-vpn/getconfig.esp
[2025-08-21T07:00:38Z INFO  openconnect::ffi] Connected to [**********]:443
[2025-08-21T07:00:38Z INFO  openconnect::ffi] SSL negotiation with [**********]
[2025-08-21T07:00:39Z INFO  openconnect::ffi] Server certificate verify failed: signer not found
[2025-08-21T07:00:39Z INFO  openconnect::ffi] Accepting the server certificate though signer not found
[2025-08-21T07:00:39Z INFO  openconnect::ffi] Connected to HTTPS on [**********] with ciphersuite (TLS1.2)-(ECDHE-SECP256R1)-(RSA-SHA256)-(AES-256-GCM)
[2025-08-21T07:00:39Z WARN  openconnect::ffi] Matching client config not found
[2025-08-21T07:00:39Z WARN  openconnect::ffi] openconnect_make_cstp_connection failed
[2025-08-21T07:00:39Z WARN  gpgui::portal_connector] Failed to connect to the gateway: g**********m

• CLI

[2025-08-21T06:55:51Z INFO  openconnect::ffi] Server certificate verify failed: signer not found
[2025-08-21T06:55:51Z INFO  openconnect::ffi] Accepting the server certificate though signer not found
[2025-08-21T06:55:51Z INFO  openconnect::ffi] Connected to HTTPS on **** with ciphersuite (TLS1.2)-(ECDHE-SECP256R1)-(RSA-SHA256)-(AES-256-GCM)
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Got HTTP response: HTTP/1.1 200 OK
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Date: Thu, 21 Aug 2025 06:55:51 GMT
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Content-Type: application/xml; charset=UTF-8
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Content-Length: 249
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Connection: keep-alive
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] X-Frame-Options: DENY
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Strict-Transport-Security: max-age=31536000;
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] X-XSS-Protection: 1; mode=block
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] X-Content-Type-Options: nosniff
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline'; img-src * data:; style-src 'self' 'unsafe-inline';
[2025-08-21T06:55:51Z DEBUG openconnect::ffi] HTTP body length:  (249)
[2025-08-21T06:55:51Z WARN  openconnect::ffi] Matching client config not found
[2025-08-21T06:55:51Z WARN  openconnect::ffi] openconnect_make_cstp_connection failed

Environment:

• OS: Ubuntu 24.04.3 LTS
• Desktop Environment: KDE
• Output of ps aux | grep 'gnome-keyring\|kwalletd5' | grep -v grep: [Required for secure store error]
  user 6280 0.0 0.1 316356 8412 ? Sl 08:35 0:00 /usr/bin/gnome-keyring-daemon --start --foreground --components=secrets user 6281 0.0 0.1 464080 10428 ? SLsl 08:35 0:00 /usr/bin/gnome-keyring-daemon --foreground --components=pkcs11,secrets --control-directory=/run/user/1000/keyring
• Is remote SSH? No

Additional context
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