diff --git a/posimai-dev/server.js b/posimai-dev/server.js
index fd4a59e5..f0f7dc3f 100644
--- a/posimai-dev/server.js
+++ b/posimai-dev/server.js
@@ -255,7 +255,7 @@ app.get('/api/check', async (req, res) => {
     const timer = setTimeout(() => ctrl.abort(), 5000);
     const r = await fetch(url, { method: 'HEAD', signal: ctrl.signal });
     clearTimeout(timer);
-    res.json({ ok: true, status: r.status, latency_ms: Date.now() - t0 });
+    res.json({ ok: r.status < 500, status: r.status, latency_ms: Date.now() - t0 });
   } catch (e) {
     res.json({ ok: false, error: e.message, latency_ms: Date.now() - t0 });
   }
diff --git a/posimai-dev/station-b.html b/posimai-dev/station-b.html
index 8d78b5b5..1819bb20 100644
--- a/posimai-dev/station-b.html
+++ b/posimai-dev/station-b.html
@@ -352,8 +352,8 @@ const SERVICES = [
     {id:'posimai-api',name:'Posimai API', desc:'Node.js / Express — VPS 本番',    url:'/api/vps-health',                                 isHealth:false, proxy:true},
     {id:'gitea',      name:'Gitea',       desc:'ローカル Git バックアップ (NAS)', url:'/api/check?url=http://100.76.7.3:3000',           isHealth:false, proxy:true},
     {id:'uptime-kuma',name:'Uptime Kuma', desc:'死活監視 — NAS Docker',           url:'/api/check?url=http://100.76.7.3:3002',           isHealth:false, proxy:true},
-    {id:'vercel',     name:'Vercel',      desc:'PWA ホスティング (27本)',           url:'https://vercel.com',                              isHealth:false},
-    {id:'github',     name:'GitHub',      desc:'ソースコード管理',                url:'https://github.com/posimai',                      isHealth:false},
+    {id:'vercel',     name:'Vercel',      desc:'PWA ホスティング (27本)',           url:'/api/check?url=https://vercel.com',               isHealth:false, proxy:true},
+    {id:'github',     name:'GitHub',      desc:'ソースコード管理',                url:'/api/check?url=https://github.com',               isHealth:false, proxy:true},
 ];
 const hist = {cpu:[], load:[]};
 const svcHist = {};
@@ -418,6 +418,7 @@ async function fetchHealth(){
     try{
         const res=await fetch(HEALTH_URL); if(!res.ok)throw new Error();
         const data=await res.json();
+        if(data.status!=='ok')throw new Error('invalid health response');
         const cpuPct=data.cpu_pct||0;
         const memPct=data.mem_total_mb?Math.round((data.mem_used_mb/data.mem_total_mb)*100):0;
         const diskPct=data.disk?.use_pct??0;
@@ -573,7 +574,7 @@ async function checkService(svc){
             const r=await fetch(svc.url,{signal:ctrl.signal});
             clearTimeout(timer);
             const data=await r.json();
-            const ok=data.ok||(data.status&&data.status<500);
+            const ok=data.ok && data.status < 500;
             const ms=data.latency_ms||0;
             badge.className='service-badge '+(ok?'ok':'crit');
             badge.textContent=ok?'OK':'DOWN';
diff --git a/posimai-dev/station.html b/posimai-dev/station.html
index 15fc5474..0a3b8707 100644
--- a/posimai-dev/station.html
+++ b/posimai-dev/station.html
@@ -336,8 +336,8 @@ const SERVICES = [
     {id:'posimai-api',name:'Posimai API',desc:'Node.js / Express — VPS 本番',   url:'/api/vps-health', isHealth:false, proxy:true},
     {id:'gitea',      name:'Gitea',       desc:'ローカル Git バックアップ',       url:'/api/check?url=http://100.76.7.3:3000',   isHealth:false, proxy:true},
     {id:'uptime-kuma',name:'Uptime Kuma', desc:'死活監視 — NAS Docker',           url:'/api/check?url=http://100.76.7.3:3002',   isHealth:false, proxy:true},
-    {id:'vercel',     name:'Vercel',      desc:'PWA ホスティング (27本)',          url:'https://vercel.com',         isHealth:false},
-    {id:'github',     name:'GitHub',      desc:'ソースコード管理',               url:'https://github.com/posimai', isHealth:false},
+    {id:'vercel',     name:'Vercel',      desc:'PWA ホスティング (27本)',          url:'/api/check?url=https://vercel.com',         isHealth:false, proxy:true},
+    {id:'github',     name:'GitHub',      desc:'ソースコード管理',               url:'/api/check?url=https://github.com', isHealth:false, proxy:true},
 ];
 const hist = {cpu:[], load:[]};
 const svcHist = {};
@@ -402,6 +402,7 @@ async function fetchHealth(){
     try{
         const res=await fetch(HEALTH_URL); if(!res.ok)throw new Error();
         const data=await res.json();
+        if(data.status!=='ok')throw new Error('invalid health response');
         const cpuPct=data.cpu_pct||0;
         const memPct=data.mem_total_mb?Math.round((data.mem_used_mb/data.mem_total_mb)*100):0;
         const diskPct=data.disk?.use_pct??0;
@@ -552,7 +553,7 @@ async function checkService(svc){
             const r=await fetch(svc.url,{signal:ctrl.signal});
             clearTimeout(timer);
             const data=await r.json();
-            const ok=data.ok||(data.status&&data.status<500);
+            const ok=data.ok && data.status < 500;
             const ms=data.latency_ms||0;
             badge.className='service-badge '+(ok?'ok':'crit');
             badge.textContent=ok?'OK':'DOWN';