diff --git a/distributed.py b/distributed.py
index 46df518..aee2359 100644
--- a/distributed.py
+++ b/distributed.py
@@ -1582,23 +1582,6 @@ async def check_file_endpoint(request):
     except Exception as e:
         return await handle_api_error(request, e, 500)
 
-@server.PromptServer.instance.routes.get("/distributed/system_info")
-async def system_info_endpoint(request):
-    """Return system information including platform details"""
-    import platform
-    
-    return web.json_response({
-        "platform": {
-            "os_name": os.name,  # 'nt' for Windows, 'posix' for Unix/Linux
-            "path_separator": os.sep,  # '\\' on Windows, '/' on Linux
-            "system": platform.system(),  # 'Windows', 'Linux', 'Darwin'
-            "machine": platform.machine(),  # 'x86_64', 'AMD64', etc.
-        },
-        "comfyui": {
-            # Can add ComfyUI-specific info here
-            "version": "distributed-extension",
-        }
-    })
 
 @server.PromptServer.instance.routes.post("/distributed/job_complete")
 async def job_complete_endpoint(request):
diff --git a/web/executionUtils.js b/web/executionUtils.js
index 4c116cd..7c493c9 100644
--- a/web/executionUtils.js
+++ b/web/executionUtils.js
@@ -83,6 +83,38 @@ export async function executeParallelDistributed(extension, promptWrapper) {
         
         extension.log(`Pre-flight check: ${activeWorkers.length} of ${enabledWorkers.length} workers are active`, "debug");
         
+        // Check if master host might be unreachable by workers (cloudflare tunnel down)
+        const masterHost = extension.config?.master?.host || '';
+        const isCloudflareHost = /\.(trycloudflare\.com|cloudflare\.dev)$/i.test(masterHost);
+        
+        if (isCloudflareHost && activeWorkers.length > 0) {
+            // Try to verify if the cloudflare tunnel is actually up
+            try {
+                const testUrl = `${window.location.protocol}//${masterHost}/distributed/status`;
+                const response = await fetch(testUrl, {
+                    method: 'GET',
+                    mode: 'cors',
+                    cache: 'no-cache',
+                    signal: AbortSignal.timeout(3000) // 3 second timeout
+                });
+                
+                if (!response.ok) {
+                    throw new Error('Master not reachable');
+                }
+            } catch (error) {
+                // Cloudflare tunnel appears to be down
+                extension.log(`Master host ${masterHost} is not reachable - cloudflare tunnel may be down`, "error");
+                
+                if (extension.ui?.showCloudflareWarning) {
+                    extension.ui.showCloudflareWarning(extension, masterHost);
+                }
+                
+                // Stop execution - workers won't be able to send results back
+                extension.log("Blocking execution - workers cannot reach master at cloudflare domain", "error");
+                return null; // This will prevent the workflow from running
+            }
+        }
+        
         // Find all distributed nodes in the workflow
         const collectorNodes = findNodesByClass(promptWrapper.output, "DistributedCollector");
         const upscaleNodes = findNodesByClass(promptWrapper.output, "UltimateSDUpscaleDistributed");
diff --git a/web/ui.js b/web/ui.js
index bdbc566..9bc0411 100644
--- a/web/ui.js
+++ b/web/ui.js
@@ -344,6 +344,131 @@ export class DistributedUI {
         }
     }
 
+    showCloudflareWarning(extension, masterHost) {
+        // Remove any existing banner first
+        const existingBanner = document.getElementById('cloudflare-warning-banner');
+        if (existingBanner) {
+            existingBanner.remove();
+        }
+
+        // Create warning banner
+        const banner = document.createElement('div');
+        banner.id = 'cloudflare-warning-banner';
+        banner.style.cssText = `
+            position: fixed;
+            top: 0;
+            left: 0;
+            right: 0;
+            background: #ff9800;
+            color: #333;
+            padding: 8px 16px;
+            text-align: center;
+            z-index: 10000;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            gap: 16px;
+            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
+            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+        `;
+        
+        const messageSpan = document.createElement('span');
+        messageSpan.innerHTML = `Connection issue: Master address <strong>${masterHost}</strong> is not reachable. The cloudflare tunnel may be offline.`;
+        messageSpan.style.fontSize = '13px';
+        
+        const resetButton = document.createElement('button');
+        resetButton.textContent = 'Reset Master Address';
+        resetButton.style.cssText = `
+            background: #333;
+            color: white;
+            border: none;
+            padding: 6px 14px;
+            border-radius: 4px;
+            cursor: pointer;
+            font-weight: 500;
+            font-size: 13px;
+            transition: background 0.2s;
+        `;
+        resetButton.onmouseover = () => resetButton.style.background = '#555';
+        resetButton.onmouseout = () => resetButton.style.background = '#333';
+        
+        const dismissButton = document.createElement('button');
+        dismissButton.textContent = 'Dismiss';
+        dismissButton.style.cssText = `
+            background: transparent;
+            color: #333;
+            border: 1px solid #333;
+            padding: 6px 14px;
+            border-radius: 4px;
+            cursor: pointer;
+            font-size: 13px;
+            transition: opacity 0.2s;
+        `;
+        dismissButton.onmouseover = () => dismissButton.style.opacity = '0.7';
+        dismissButton.onmouseout = () => dismissButton.style.opacity = '1';
+        
+        // Add click handlers
+        resetButton.onclick = async () => {
+            resetButton.disabled = true;
+            resetButton.textContent = 'Resetting...';
+            
+            try {
+                // Save with empty host - this will trigger auto-detection
+                await extension.api.updateMaster({ 
+                    name: extension.config?.master?.name || "Master",
+                    host: "" 
+                });
+                
+                // The API call above doesn't trigger auto-detection, so we need to do it
+                await extension.detectMasterIP();
+                
+                // Reload config to get the new detected IP
+                await extension.loadConfig();
+                
+                // Update UI if sidebar is open
+                if (extension.panelElement) {
+                    const hostInput = document.getElementById('master-host');
+                    if (hostInput) {
+                        hostInput.value = extension.config?.master?.host || "";
+                    }
+                }
+                
+                // Show success message
+                extension.app.extensionManager.toast.add({
+                    severity: "success",
+                    summary: "Master Host Reset",
+                    detail: `IP auto-detected: ${extension.config?.master?.host || 'detecting...'}`,
+                    life: 4000
+                });
+                
+                banner.remove();
+            } catch (error) {
+                resetButton.disabled = false;
+                resetButton.textContent = 'Reset Master Host';
+                extension.log(`Failed to reset master host: ${error.message}`, "error");
+            }
+        };
+        
+        dismissButton.onclick = () => banner.remove();
+        
+        // Assemble banner
+        banner.appendChild(messageSpan);
+        banner.appendChild(resetButton);
+        banner.appendChild(dismissButton);
+        
+        // Add to page
+        document.body.prepend(banner);
+        
+        // Auto-dismiss after 30 seconds
+        setTimeout(() => {
+            if (document.getElementById('cloudflare-warning-banner')) {
+                banner.style.transition = 'opacity 0.5s';
+                banner.style.opacity = '0';
+                setTimeout(() => banner.remove(), 500);
+            }
+        }, 30000);
+    }
+
     updateStatusDot(workerId, color, title, pulsing = false) {
         const statusDot = document.getElementById(`status-${workerId}`);
         if (!statusDot) return;