diff --git a/webui/src/pages/Setup.jsx b/webui/src/pages/Setup.jsx
index fd21c42..1da4d9f 100644
--- a/webui/src/pages/Setup.jsx
+++ b/webui/src/pages/Setup.jsx
@@ -301,16 +301,20 @@ function Step2Domain({
     setCfStatus('checking');
     try {
       const res = await setupAPI.validate('cloudflare_token', { token: cloudflareToken });
-      setCfStatus(res.data?.valid ? 'valid' : 'invalid');
-    } catch { setCfStatus('invalid'); }
+      const result = res.data?.valid ? 'valid' : 'invalid';
+      setCfStatus(result);
+      return result;
+    } catch { setCfStatus('invalid'); return 'invalid'; }
   };
 
   const verifyDns = async () => {
     setDnsStatus('checking');
     try {
       const res = await setupAPI.validate('duckdns_token', { subdomain: duckSub, token: duckdnsToken });
-      setDnsStatus(res.data?.valid ? 'valid' : 'invalid');
-    } catch { setDnsStatus('invalid'); }
+      const result = res.data?.valid ? 'valid' : 'invalid';
+      setDnsStatus(result);
+      return result;
+    } catch { setDnsStatus('invalid'); return 'invalid'; }
   };
 
   const handleNext = async () => {
@@ -324,14 +328,31 @@ function Step2Domain({
         setNextLoading(true);
         const result = await checkPicAvail(picName);
         setNextLoading(false);
-        if (result === 'taken') e.name = 'This subdomain is already taken. Choose another.';
+        if (result === 'taken')
+          e.name = 'This subdomain is already taken. Choose another.';
+        else if (result !== 'available')
+          e.name = 'Could not reach the DDNS service. Check your connection or choose a different domain option.';
       }
     } else if (domainType === 'cloudflare') {
       if (!customDomain || !DOMAIN_RE.test(customDomain)) e.domain = 'Enter a valid domain (e.g. home.example.com).';
-      if (!cloudflareToken.trim()) e.token = 'Cloudflare API token is required.';
+      if (!cloudflareToken.trim()) {
+        e.token = 'Cloudflare API token is required.';
+      } else if (cfStatus !== 'valid') {
+        setNextLoading(true);
+        const result = await verifyCf();
+        setNextLoading(false);
+        if (result !== 'valid') e.token = 'Cloudflare token is invalid or could not be verified.';
+      }
     } else if (domainType === 'duckdns') {
       if (!duckSub) e.name = 'DuckDNS subdomain is required.';
-      if (!duckdnsToken.trim()) e.token = 'DuckDNS token is required.';
+      if (!duckdnsToken.trim()) {
+        e.token = 'DuckDNS token is required.';
+      } else if (dnsStatus !== 'valid') {
+        setNextLoading(true);
+        const result = await verifyDns();
+        setNextLoading(false);
+        if (result !== 'valid') e.token = 'DuckDNS token is invalid or could not be verified.';
+      }
     } else if (domainType === 'http01') {
       if (!customDomain || !DOMAIN_RE.test(customDomain)) e.domain = 'Enter a valid domain (e.g. home.example.com).';
     }