Win10更新后本地域Excel Add-in无法加载求助（附manifest.xml）

Hey Alex, let's figure out why your Excel Add-in stopped loading after that Windows 10 update. I’ve gone through your manifest.xml and put together some targeted troubleshooting steps to try:

Windows 10 updates frequently tweak security rules, especially for local/intranet resources like your exceladdin.local domain:

• Open Internet Options > Security > Local intranet and confirm https://exceladdin.local is added to the zone. If not, click "Sites > Advanced" and add it.
• Ensure the Local intranet security level is set to Medium-Low or Medium—a "High" setting can block local add-ins from loading.
• Disable Enhanced Protected Mode in Internet Options > Advanced > Security (uncheck the box) and restart Excel. This feature sometimes interferes with intranet add-ins after updates.

Looking at your manifest, there’s a small detail that might be causing validation failures:

• The IdentityAPI set doesn’t have a minimum version specified. Office requires version constraints for all required sets. Update that line to:

  <Set Name="IdentityAPI" MinVersion="1.1"/>
  

• Double-check your HTTPS certificate for exceladdin.local: Windows updates can reset trusted root certs. Make sure the cert is installed in Local Computer > Trusted Root Certification Authorities (you can import it again if needed).

Corrupted cache is a super common issue after system updates. Here’s how to wipe it:

• Close all Office apps completely.
• Delete all files/folders in these locations:
  • %LOCALAPPDATA%\Microsoft\Office\16.0\Wef\ (adjust the version number if you’re using an older Office release)
  • %LOCALAPPDATA%\Temp\OfficeAddins\
• Restart Excel and try loading the add-in again.

If the above steps don’t work, turn on Office’s add-in logging to pinpoint the exact issue:

• Go to File > Options > Trust Center > Trust Center Settings > Add-ins.
• Check "Enable add-in runtime logging" and choose a location for the log file.
• Attempt to load your add-in, then open the log file. Look for keywords like "certificate error", "manifest validation failed", or "network timeout"—these will tell you exactly what’s breaking.

Windows updates can mess with firewall or DNS settings:

• Open Command Prompt and run ping exceladdin.local to make sure it resolves to your local server’s IP.
• Check Windows Firewall to confirm Excel is allowed to communicate with your local domain (add an inbound/outbound rule if needed).
• Open https://exceladdin.local directly in Edge or IE—if you get certificate warnings or can’t access the site, that’s the root cause.

Give these steps a try, and let me know if you run into specific error messages or if one of these fixes gets your add-in working again!

内容的提问来源于stack exchange，提问作者Alex K