diff --git a/backend/routes/mikrotikConfigRoutes.js b/backend/routes/mikrotikConfigRoutes.js
index 9d4bb29..6bbb5eb 100644
--- a/backend/routes/mikrotikConfigRoutes.js
+++ b/backend/routes/mikrotikConfigRoutes.js
@@ -238,8 +238,11 @@ const APPLY_TIMEOUT_MS = Number(process.env.MIKROTIK_APPLY_TIMEOUT_MS) || 60000;
  */
 async function applyMikrotikConfig(req, res) {
   let conn = null;
+  const mikrotikRequests = [];
+  const body = req.body || {};
+  console.log('[MikroTik apply] Request body:', { serverId: body.serverId, type: body.type, dryRun: body.dryRun });
   try {
-    const { serverId, type = 'all', dryRun = true } = req.body || {};
+    const { serverId, type = 'all', dryRun = true } = body;
     if (!serverId) {
       return sendError(res, 400, 'serverId is required', 'E_BAD_REQUEST');
     }
@@ -290,7 +293,15 @@ async function applyMikrotikConfig(req, res) {
         port: Number(port) || 8728,
       });
       try {
+        console.log('[MikroTik apply] Connecting to', host + ':' + port, 'user:', user);
         await conn.connect();
+        const originalWrite = conn.write.bind(conn);
+        conn.write = async function (path, args) {
+          const req = { path, args: args || [] };
+          mikrotikRequests.push(req);
+          console.log('[MikroTik API]', path, req.args);
+          return originalWrite(path, args);
+        };
         const allResults = [];
         for (const block of blocks) {
           const blockResults = await applyBlock(conn, block, !!dryRun);
@@ -308,7 +319,7 @@ async function applyMikrotikConfig(req, res) {
           skipped: allResults.flatMap(b => b.results).filter(r => r.status === 'skip').length,
           errors: allResults.flatMap(b => b.results).filter(r => r.status === 'error'),
         };
-        return { ok: true, dryRun: !!dryRun, summary, results: allResults };
+        return { ok: true, dryRun: !!dryRun, summary, results: allResults, mikrotikRequests };
       } catch (err) {
         if (conn) try { conn.close(); } catch (_) {}
         conn = null;
@@ -326,12 +337,14 @@ async function applyMikrotikConfig(req, res) {
     if (conn) try { conn.close(); } catch (_) {}
     console.error('Error applying MikroTik config:', error);
     const msg = error.message || String(error);
-    return res.status(500).json({
+    const errPayload = {
       ok: false,
       error: msg.includes('ECONNREFUSED') ? 'Соединение отклонено. Проверьте хост и порт.' :
         msg.includes('ETIMEDOUT') || msg.includes('Таймаут') ? msg :
           msg.includes('Authentication') || msg.includes('login') ? 'Неверный логин или пароль' : msg,
-    });
+    };
+    if (mikrotikRequests.length > 0) errPayload.mikrotikRequests = mikrotikRequests;
+    return res.status(500).json(errPayload);
   }
 }
 
diff --git a/frontend/src/NetworkConfigManager.jsx b/frontend/src/NetworkConfigManager.jsx
index 3973e53..ffebbce 100644
--- a/frontend/src/NetworkConfigManager.jsx
+++ b/frontend/src/NetworkConfigManager.jsx
@@ -2229,37 +2229,49 @@ function NetworkConfigManager() {
     setApplyLoading(true);
     if (dryRunOverride !== null) setApplyResult(null);
 
+    const requestBody = { serverId: applyServerId, type: 'all', dryRun: useDryRun };
+    console.log('[MikroTik apply] Request:', { url: '/api/mikrotik/apply', method: 'POST', body: requestBody });
+
     try {
       const response = await fetch('/api/mikrotik/apply', {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
         },
-        body: JSON.stringify({
-          serverId: applyServerId,
-          type: 'all',
-          dryRun: useDryRun,
-        }),
+        body: JSON.stringify(requestBody),
       });
 
-      const data = await response.json().catch(() => ({}));
+      console.log('[MikroTik apply] Response:', { status: response.status, ok: response.ok, url: response.url });
+
+      const data = await response.json().catch((parseErr) => {
+        console.warn('[MikroTik apply] JSON parse error:', parseErr);
+        return {};
+      });
 
       if (!response.ok || data.ok === false) {
         const errorMessage = data.error || data.message || `HTTP ${response.status}`;
-        setApplyResult({ ok: false, error: errorMessage });
+        console.error('[MikroTik apply] Error:', { status: response.status, error: errorMessage, data });
+        setApplyResult({ ok: false, error: errorMessage, mikrotikRequests: data.mikrotikRequests });
         notify.error('Не удалось применить конфигурацию по API');
         return;
       }
 
+      console.log('[MikroTik apply] Success:', data);
+      if (data.mikrotikRequests?.length) {
+        console.log('[MikroTik apply] Запросы к MikroTik:', data.mikrotikRequests);
+      }
       setApplyResult(data);
 
       if (data.ok && !useDryRun) {
         notify.success(`Применено: создано ${data.summary?.created || 0}, обновлено ${data.summary?.updated || 0}, пропущено ${data.summary?.skipped || 0}`);
       }
     } catch (error) {
+      console.error('[MikroTik apply] Fetch failed:', error);
+      const errMsg = error.message || 'Ошибка применения';
+      const hint = errMsg.includes('fetch') || errMsg.includes('Failed') ? ' Проверьте логи backend — при ERR_EMPTY_RESPONSE сервер мог не ответить.' : '';
       setApplyResult({
         ok: false,
-        error: error.message || 'Ошибка применения',
+        error: errMsg + hint,
       });
       notify.error('Не удалось применить конфигурацию по API');
     } finally {
@@ -5373,9 +5385,31 @@ function NetworkConfigManager() {
                             </ul>
                           </div>
                         ))}
+                        {applyResult.mikrotikRequests?.length > 0 && (
+                          <details className="mt-3">
+                            <summary className="text-muted small cursor-pointer">Запросы к MikroTik API ({applyResult.mikrotikRequests.length})</summary>
+                            <pre className="bg-dark text-light p-2 rounded small mt-2 mb-0" style={{ maxHeight: '200px', overflow: 'auto', fontSize: '0.75rem' }}>
+                              {applyResult.mikrotikRequests.map((req, i) => (
+                                <div key={i}>{req.path} {Array.isArray(req.args) ? req.args.join(' ') : ''}</div>
+                              ))}
+                            </pre>
+                          </details>
+                        )}
                       </>
                     ) : (
-                      <div className="alert alert-danger mb-0">{applyResult.error}</div>
+                      <>
+                        <div className="alert alert-danger mb-2">{applyResult.error}</div>
+                        {applyResult.mikrotikRequests?.length > 0 && (
+                          <details className="mt-2">
+                            <summary className="text-muted small cursor-pointer">Запросы к MikroTik API до ошибки ({applyResult.mikrotikRequests.length})</summary>
+                            <pre className="bg-dark text-light p-2 rounded small mt-2 mb-0" style={{ maxHeight: '200px', overflow: 'auto', fontSize: '0.75rem' }}>
+                              {applyResult.mikrotikRequests.map((req, i) => (
+                                <div key={i}>{req.path} {Array.isArray(req.args) ? req.args.join(' ') : ''}</div>
+                              ))}
+                            </pre>
+                          </details>
+                        )}
+                      </>
                     )}
                   </>
                 )}