diff --git a/frontend/src/components/TerminalModal.jsx b/frontend/src/components/TerminalModal.jsx
index 52cef67..4c3e8ce 100644
--- a/frontend/src/components/TerminalModal.jsx
+++ b/frontend/src/components/TerminalModal.jsx
@@ -54,11 +54,11 @@ export default function TerminalModal({ agentId, agentName, onClose }) {
     xtermRef.current = term
     fitRef.current = fitAddon
 
-    // WebSocket verbinden
+    // WebSocket verbinden — ueber Nginx-Proxy (gleicher Origin, kein Zertifikatsproblem)
     const cols = term.cols || 220
     const rows = term.rows || 50
-    const protocol = window.location.protocol === 'https:' ? 'wss:' : 'wss:'
-    const wsUrl = `wss://${backendHost}:8443/api/v1/agents/${agentId}/terminal?cols=${cols}&rows=${rows}&api_key=${apiKey}`
+    const wsProtocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:'
+    const wsUrl = `${wsProtocol}//${window.location.host}/api/v1/agents/${agentId}/terminal?cols=${cols}&rows=${rows}&api_key=${apiKey}`
 
     const ws = new WebSocket(wsUrl)
     ws.binaryType = 'arraybuffer'