[Solved] Problem Reverse Proxy Caddy and Login Synology DSM with Yubikey

[Patrick M. Hausen]

Your backend did not provide a complete response - check the log files of your backend.

[Ronny1978]

Hello Patrick.

Thank you for helping me. May be this?

Code Select Expand

[2026-04-16 14:03:34.284 +00:00] [INF] Sending ForceKeepAlive message to 1 inactive WebSockets.
[2026-04-16 14:03:46.284 +00:00] [INF] Lost 1 WebSockets.
[2026-04-16 14:30:56.131 +00:00] [WRN] WS "10.0.80.1" error receiving data: "The remote party closed the WebSocket connection without completing the close handshake."
[2026-04-16 14:30:56.142 +00:00] [INF] WS "10.0.80.1" closed
[2026-04-16 15:04:41.396 +00:00] [INF] WS "10.0.80.1" request

[Patrick M. Hausen]

You configured the host header as linked by me and activated that host header in your handler configuration under "Transport"?