fix(dev): only treat EADDRINUSE as port conflict in wildcard pre-check

packages/vite/src/node/__tests__/http.spec.ts

@@ -1,5 +1,7 @@
 import http from 'node:http'
-import { afterEach, describe, expect, test } from 'vitest'
+import net from 'node:net'
+import { afterEach, describe, expect, test, vi } from 'vitest'
+import { wildcardHosts } from '../constants'
 import { createServer } from '..'
 import type { ViteDevServer } from '..'
 
@@ -157,6 +159,44 @@ describe('port detection', () => {
     })
   })
 
+  test('non-EADDRINUSE errors on wildcard do not block port selection', async () => {
+    const originalCreateServer = net.createServer.bind(net)
+    using _ = vi.spyOn(net, 'createServer').mockImplementation(() => {
+      const server = originalCreateServer()
+      const originalListen = server.listen.bind(server)
+      // @ts-expect-error this is the overload used internally
+      server.listen = (
+        port: number,
+        host: string,
+        ...args: unknown[]
+      ): net.Server => {
+        if (wildcardHosts.has(host)) {
+          process.nextTick(() => {
+            const err: NodeJS.ErrnoException = new Error(
+              'listen EACCES: permission denied',
+            )
+            err.code = 'EACCES'
+            server.emit('error', err)
+          })
+          return server
+        }
+        // @ts-expect-error this is the overload used internally
+        return originalListen(port, host, ...args)
+      }
+      return server
+    })
+
+    viteServer = await createServer({
+      root: import.meta.dirname,
+      logLevel: 'silent',
+      server: { port: BASE_PORT, strictPort: false, ws: false },
+    })
+    await viteServer.listen()
+
+    const address = viteServer.httpServer!.address()
+    expect(address).toStrictEqual(expect.objectContaining({ port: BASE_PORT }))
+  })
+
   test('throws error when port is blocked and strictPort is true', async () => {
     await using _blockingServer = await createSimpleServer(
       BASE_PORT,

packages/vite/src/node/http.ts

@@ -177,9 +177,8 @@ async function isPortAvailable(port: number): Promise<boolean> {
 function tryListen(port: number, host: string): Promise<boolean> {
   return new Promise((resolve) => {
     const server = net.createServer()
-    server.once('error', () => {
-      // Ensure server is closed even on error to prevent resource leaks
-      server.close(() => resolve(false))
+    server.once('error', (e: NodeJS.ErrnoException) => {
+      server.close(() => resolve(e.code !== 'EADDRINUSE'))
     })
     server.once('listening', () => {
       server.close(() => resolve(true))
@@ -193,10 +192,10 @@ async function tryBindServer(
   port: number,
   host: string | undefined,
 ): Promise<
-  { success: true } | { success: false; error: Error & { code?: string } }
+  { success: true } | { success: false; error: NodeJS.ErrnoException }
 > {
   return new Promise((resolve) => {
-    const onError = (e: Error & { code?: string }) => {
+    const onError = (e: NodeJS.ErrnoException) => {
       httpServer.off('error', onError)
       httpServer.off('listening', onListening)
       resolve({ success: false, error: e })