I have tried multiple versions of OpenConnect MinGW64/GnuTLS on my Windows 10 20H2 virtual machine: * [tip of branch `master`](https://gitlab.com/openconnect/openconnect/-/commit/1bf24bd5bbebd24d49f1103098e5ff9eaafce1c0) * [branch `working_version`](https://gitlab.com/openconnect/openconnect/-/commit/4a77079d4401bdcda18925f5af23ae81181df151) I have just created to build artefacts using a commit that has been working well for me * [branch `tdebaets:windows_ctrl_signal_handler`](https://gitlab.com/tdebaets/openconnect/-/tree/windows_ctrl_signal_handler) I was able to run OpenConnect successfully only **once** this morning. All subsequent runs have been failing consistently. OpenConnect runs smoothly until `vpnc-script-win.js` is executed, then OpenConnect exits abruptly without printing anything: <details> <summary>Output of openconnect -v</summary> ``` C:\Program Files\OpenConnect>.\openconnect.exe --protocol=fortinet --no-dtls -u xxxxxxx xxxxx.xxxx.xx -v GET https://xxxxx.xxxx.xx/ Attempting to connect to server xxx.xx.x.xxx:443 Connected to xxx.xx.x.xxx:443 SSL negotiation with xxxxx.xxxx.xx Connected to HTTPS on xxxxx.xxxx.xx with ciphersuite (TLS1.3)-(ECDHE-SECP384R1)-(RSA-PSS-RSAE-SHA256)-(AES-256-GCM) Got HTTP response: HTTP/1.1 200 OK Date: Fri, 14 Jan 2022 12:43:25 GMT Server: xxxxxxxx-xxxxx Last-Modified: Thu, 09 Dec 2021 09:09:20 GMT ETag: "83-61b1c7c0" Accept-Ranges: bytes Content-Length: 131 Content-Type: text/html X-Frame-Options: SAMEORIGIN Content-Security-Policy: frame-ancestors 'self'; object-src 'none'; script-src 'self' https 'unsafe-eval' 'unsafe-inline'; X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Strict-Transport-Security: max-age=31536000 HTTP body length: (131) Password: POST https://xxxxx.xxxx.xx/remote/logincheck Got HTTP response: HTTP/1.1 200 OK Date: Fri, 14 Jan 2022 12:43:28 GMT Server: xxxxxxxx-xxxxx Set-Cookie: SVPNCOOKIE=<elided>; path=/; secure; httponly Transfer-Encoding: chunked Content-Type: text/html X-Frame-Options: SAMEORIGIN Content-Security-Policy: frame-ancestors 'self'; object-src 'none'; script-src 'self' https 'unsafe-eval' 'unsafe-inline'; X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Strict-Transport-Security: max-age=31536000 HTTP body chunked (-2) GET https://xxxxx.xxxx.xx/remote/fortisslvpn_xml Got HTTP response: HTTP/1.1 200 OK Date: Fri, 14 Jan 2022 12:43:28 GMT Server: xxxxxxxx-xxxxx Transfer-Encoding: chunked Content-Type: text/xml X-Frame-Options: SAMEORIGIN Content-Security-Policy: frame-ancestors 'self'; object-src 'none'; script-src 'self' https 'unsafe-eval' 'unsafe-inline'; X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Strict-Transport-Security: max-age=31536000 HTTP body chunked (-2) Reported platform is FGT60D v6.00.14 build 0457 branch 0457 Got search domain xxxx.xx xxx.xxxx.xx xxx.xx Got IPv4 DNS server xxx.xx.xxx.xxx Got IPv4 DNS server xxx.xx.xxx.xxx Got Legacy IP address 10.212.134.200 Idle timeout is 0 minutes. Server did not send <auth-ses tun-connect-without-reauth="0/1"/>. OpenConnect will probably not be able to reconnect if dead peer is detected. If reconnection DOES, work please report to <openconnect-devel@lists.infradead.org> Requesting calculated MTU of 1351 Sending our LCP/id 1 config request to server PPP state transition from DEAD to ESTABLISH on TLS channel Received magic number of 0x9a446b75 from server Ack LCP/id 1 config from server Sending our IPCP/id 1 config request to server PPP state transition from ESTABLISH to OPENED on TLS channel Received peer IPv4 address xxx.xx.x.xxx from server Ack IPCP/id 1 config from server PPP state transition from OPENED to NETWORK on TLS channel Configured as 10.212.134.200, with SSL connected and DTLS disabled Session authentication will expire at Fri Jan 14 21:43:29 2022 Microsoft (R) Windows Script Host Version 5.812 Copyright (C) Microsoft Corporation. Tous droits réservés. C:\Program Files\OpenConnect> ``` </details> <details> <summary>Error reported by Event Viewer</summary>  </details> This is probably not an OpenConnect issue. Instead, something must have changed on this machine, triggering this error, but I am unable to tell what. The Event Viewer does report an error, but it doesn't make sense to me. Any clue how to debug this?