diff --git a/vite-frontend/src/pages/node/tunnel-monitor-view.tsx b/vite-frontend/src/pages/node/tunnel-monitor-view.tsx
index 3eec8a3..b51aeeb 100644
--- a/vite-frontend/src/pages/node/tunnel-monitor-view.tsx
+++ b/vite-frontend/src/pages/node/tunnel-monitor-view.tsx
@@ -1170,6 +1170,7 @@ export function TunnelMonitorView({
           {tunnels.map((tunnel) => {
             const quality = qualityMap[tunnel.id];
             const isEnabled = tunnel.status === 1;
+            const targetLabel = probeTargetLabel(quality);
 
             return (
               <Card
@@ -1223,13 +1224,16 @@ export function TunnelMonitorView({
                       />
                     </div>
                     <div className="space-y-1">
-                      <div
-                        className="text-[10px] text-default-500 flex items-center gap-1"
-                        title={probeTargetLabel(quality)}
-                      >
+                      <div className="text-[10px] text-default-500 flex items-center gap-1">
                         <Globe className="w-3 h-3" />
                         出口→测试目标
                       </div>
+                      <div
+                        aria-label={`测试目标 ${targetLabel}`}
+                        className="text-[10px] text-default-400 truncate"
+                      >
+                        {targetLabel}
+                      </div>
                       <UptimeHistoryBar
                         history={qualityHistoryMap[tunnel.id]}
                         latestValue={quality?.exitToBingLatency}
@@ -1291,6 +1295,7 @@ export function TunnelMonitorView({
               {tunnels.map((tunnel) => {
                 const quality = qualityMap[tunnel.id];
                 const isEnabled = tunnel.status === 1;
+                const targetLabel = probeTargetLabel(quality);
 
                 return (
                   <TableRow
@@ -1319,12 +1324,20 @@ export function TunnelMonitorView({
                         type="entryToExit"
                       />
                     </TableCell>
-                    <TableCell title={probeTargetLabel(quality)}>
-                      <UptimeHistoryBar
-                        history={qualityHistoryMap[tunnel.id]}
-                        latestValue={quality?.exitToBingLatency}
-                        type="exitToBing"
-                      />
+                    <TableCell>
+                      <div
+                        aria-label={`出口到测试目标 ${targetLabel}`}
+                        className="space-y-1"
+                      >
+                        <UptimeHistoryBar
+                          history={qualityHistoryMap[tunnel.id]}
+                          latestValue={quality?.exitToBingLatency}
+                          type="exitToBing"
+                        />
+                        <span className="block max-w-[160px] truncate text-[10px] text-default-400">
+                          {targetLabel}
+                        </span>
+                      </div>
                     </TableCell>
                     <TableCell>
                       {quality?.timestamp ? (
diff --git a/vite-frontend/src/pages/tunnel/form.ts b/vite-frontend/src/pages/tunnel/form.ts
index bb7b4f1..e6b636c 100644
--- a/vite-frontend/src/pages/tunnel/form.ts
+++ b/vite-frontend/src/pages/tunnel/form.ts
@@ -17,6 +17,93 @@ interface TunnelNodeInput {
   status: number;
 }
 
+const isValidProbeIPv4 = (host: string) => {
+  const parts = host.split(".");
+
+  return (
+    parts.length === 4 &&
+    parts.every((part) => {
+      if (!/^\d+$/.test(part)) {
+        return false;
+      }
+
+      const value = Number(part);
+
+      return value >= 0 && value <= 255;
+    })
+  );
+};
+
+const isIPv4LikeProbeHost = (host: string) =>
+  /^[0-9.]+$/.test(host) && host.includes(".");
+
+const isValidProbeIPv6 = (host: string) => {
+  let value = host;
+
+  if (host.startsWith("[") || host.endsWith("]")) {
+    if (!host.startsWith("[") || !host.endsWith("]")) {
+      return false;
+    }
+    value = host.slice(1, -1);
+  }
+
+  if (!value.includes(":") || value.includes("[") || value.includes("]")) {
+    return false;
+  }
+
+  try {
+    const url = new URL(`http://[${value}]`);
+
+    return url.hostname.length > 0;
+  } catch {
+    return false;
+  }
+};
+
+const isSchemeLikeProbeHost = (host: string) => {
+  if (isValidProbeIPv6(host)) {
+    return false;
+  }
+
+  const colonIndex = host.indexOf(":");
+
+  if (colonIndex <= 0) {
+    return false;
+  }
+
+  return /^[A-Za-z][A-Za-z0-9+.-]*$/.test(host.slice(0, colonIndex));
+};
+
+const isValidProbeDomain = (host: string) => {
+  if (!host || host.length > 253) {
+    return false;
+  }
+
+  return host.split(".").every((label) => {
+    if (
+      !label ||
+      label.length > 63 ||
+      label.startsWith("-") ||
+      label.endsWith("-")
+    ) {
+      return false;
+    }
+
+    return /^[A-Za-z0-9-]+$/.test(label);
+  });
+};
+
+const isValidProbeTargetHost = (host: string) => {
+  if (isValidProbeIPv6(host) || isValidProbeIPv4(host)) {
+    return true;
+  }
+  if (host.includes(":") || isIPv4LikeProbeHost(host)) {
+    return false;
+  }
+
+  return isValidProbeDomain(host);
+};
+
 export const createTunnelFormDefaults = () => {
   return {
     name: "",
@@ -75,8 +162,14 @@ export const validateTunnelForm = (
   if (probeHost || hasProbePort) {
     if (!probeHost) {
       errors.probeTargetHost = "请输入测试目标 Host";
-    } else if (probeHost.includes("://") || /[\s/?#]/.test(probeHost)) {
-      errors.probeTargetHost = "Host 不能包含协议、空格或路径";
+    } else if (
+      probeHost.includes("://") ||
+      /[\s/?#]/.test(probeHost) ||
+      isSchemeLikeProbeHost(probeHost)
+    ) {
+      errors.probeTargetHost = "Host 不能包含协议、端口、空格或路径";
+    } else if (!isValidProbeTargetHost(probeHost)) {
+      errors.probeTargetHost = "测试目标 Host 格式无效";
     }
 
     if (!Number.isInteger(probePort) || probePort < 1 || probePort > 65535) {