Windows更新後IIS服務(wù)器常見問題可通過以下步驟排查解決：1. 若IIS服務(wù)無法啟動，檢查服務(wù)狀態(tài)及事件日誌，嘗試重啟服務(wù)或重新註冊/安裝IIS；2. 應(yīng)用程序池異常崩潰時，查看應(yīng)用程序日誌，確認.NET版本與權(quán)限設(shè)置，嘗試重置身份或使用內(nèi)置賬戶；3. 網(wǎng)站出現(xiàn)HTTP 500錯誤或空白頁時，啟用詳細錯誤信息、檢查模塊配置，並通過本地瀏覽和簡單頁面測試定位問題；4. SSL綁定或證書失效時，驗證綁定配置、證書信任與私鑰權(quán)限，檢測端口衝突並使用工具測試SSL連接，必要時重新綁定證書或更新根證書。

After applying Windows updates, IIS servers can sometimes run into issues ranging from failed websites to complete service outages. This isn't uncommon—especially after major updates—but it can be frustrating if you're not prepared. The good news is that most problems have known causes and solutions.

1. IIS Services Fail to Start

One of the most common issues after a Windows update is that IIS services (like World Wide Web Publishing Service or WAS) fail to start. This often happens due to configuration conflicts or missing dependencies post-update.

• Check Services ( services.msc ) to see if W3SVC or WAS are stuck in "Starting" or marked as "Stopped."
• Look at the Event Viewer logs under Windows Logs > System for errors related to IIS services.
• Try restarting the server—if services still don't start, consider re-registering IIS using appcmd or re-installing IIS via Server Manager.

If services won't start, try this:

• Open Command Prompt as Administrator
• Run: net stop w3svc and net stop was
• Then: net start w3svc and net start was

Sometimes, just resetting the services helps.

2. Application Pools Crash or Recycle Unexpectedly

After an update, app pools might crash on startup or recycle more frequently than usual. This can be due to .NET runtime changes, permission issues, or corrupted application pool configurations.

• Check the Application Event Log for errors like “The worker process failed to initialize correctly.”
• Make sure the correct version of the .NET Framework is selected in the Application Pool settings.
• If using a custom identity for the app pool, verify the credentials are still valid—sometimes domain account passwords expire or permissions reset after updates.

A few things to try:

• Reset the App Pool identity
• Temporarily switch to a built-in account like ApplicationPoolIdentity
• Reboot the server if the issue persists

Also, check if any recent patches require a newer version of .NET or need specific registry keys updated.

3. Websites Return HTTP 500 Errors or Blank Pages

HTTP 500 Internal Server Errors or completely blank pages usually point to misconfigured web apps or broken module dependencies after an update.

• Enable detailed error messages in IIS or web.config to get more info about what's failing.
• Check if any native or managed modules were affected by the update—some security patches disable outdated or insecure modules by default.
• If your site uses URL Rewrite or Dynamic Content Compression, make sure those features are still installed and configured.

Quick troubleshooting steps:

• Use inetmgr to open IIS Manager and browse the site locally—this bypasses network-related issues
• Review the IIS logs located in %SystemDrive%\inetpub\logs\LogFiles
• Test with a simple index.html file to rule out code-level issues

Don't forget to clear browser cache or test in incognito mode—sometimes browsers serve cached 500 errors even after the problem is fixed.

4. SSL Bindings or Certificates Stop Working

It's not unusual for SSL bindings or certificate trust chains to break after certain OS updates—especially those involving Schannel or TLS stack changes.

• Check if the HTTPS binding is still present and pointing to the correct certificate.
• Use the MMC Certificates snap-in to ensure the certificate is still trusted and not expired.
• Verify that the private key is accessible—sometimes permissions on the private key get reset after updates.

Try these checks:

• Use netsh interface ipv4 show excludedportrange protocol=tcp to confirm no port conflicts exist
• Test the SSL connection using tools like openssl s_client -connect localhost:443
• Rebind the certificate through IIS Manager or PowerShell if needed

Also, make sure your server has the latest root certificates installed—some updates may remove or deprecate older roots.

That's basically it. While Windows updates are important for security and stability, they can disrupt IIS setups in predictable ways. Keeping an eye on logs, knowing where to look for broken links in the chain, and testing incrementally can help you resolve issues faster. It's not rocket science, but it does require attention to detail.

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