diff --git a/server/app/api/proxy/[[...path]]/route.ts b/server/app/api/proxy/[[...path]]/route.ts
index 1008cc5..7150582 100644
--- a/server/app/api/proxy/[[...path]]/route.ts
+++ b/server/app/api/proxy/[[...path]]/route.ts
@@ -111,7 +111,8 @@ async function proxyRequest(req: NextRequest) {
     });
   }
 
-  // For text responses, rewrite localhost/internal URLs to the public URL
+  // For text responses, rewrite localhost/internal URLs to the public URL.
+  // Also handle protocol-relative URLs that some WordPress plugins/themes use.
   let body = await upstreamRes.text();
   const localBase = `http://${instance.node.tailscaleIp}:${instance.port}`;
   const localBaseHttps = `https://${instance.node.tailscaleIp}:${instance.port}`;
@@ -119,6 +120,8 @@ async function proxyRequest(req: NextRequest) {
   const localLocalhostHttps = `https://localhost:${instance.port}`;
   const localLocalhostPlainHttp = `http://localhost`;
   const localLocalhostPlainHttps = `https://localhost`;
+  const localLocalhostProtocolRelative = `//localhost`;
+  const localTailscaleProtocolRelative = `//${instance.node.tailscaleIp}:${instance.port}`;
 
   body = body
     .replaceAll(localBase, publicUrl)
@@ -126,7 +129,9 @@ async function proxyRequest(req: NextRequest) {
     .replaceAll(localLocalhostHttp, publicUrl)
     .replaceAll(localLocalhostHttps, publicUrl)
     .replaceAll(localLocalhostPlainHttp, publicUrl)
-    .replaceAll(localLocalhostPlainHttps, publicUrl);
+    .replaceAll(localLocalhostPlainHttps, publicUrl)
+    .replaceAll(localTailscaleProtocolRelative, publicUrl.replace(/^https?:/, ""))
+    .replaceAll(localLocalhostProtocolRelative, publicUrl.replace(/^https?:/, ""));
 
   return new Response(body, {
     status: upstreamRes.status,
diff --git a/server/app/api/websocket/route.ts b/server/app/api/websocket/route.ts
index c763e43..6ee9fbc 100644
--- a/server/app/api/websocket/route.ts
+++ b/server/app/api/websocket/route.ts
@@ -5,8 +5,14 @@ const globalWss = globalThis as typeof globalThis & { __eduboxWss?: WebSocketSer
 
 if (!globalWss.__eduboxWss) {
   try {
-    globalWss.__eduboxWss = new WebSocketServer({ port: 3001 });
-    initWebSocketServer(globalWss.__eduboxWss);
+    const wss = new WebSocketServer({ port: 3001 });
+    wss.on("error", (err) => {
+      // Silently ignore EADDRINUSE during build/hot reload; the existing
+      // server will keep handling agent connections.
+      console.warn("WebSocket server error:", (err as Error).message);
+    });
+    globalWss.__eduboxWss = wss;
+    initWebSocketServer(wss);
   } catch {
     // Port may be in use during build or hot reload
   }