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psalm100_1's avatar
psalm100_1
Copper Contributor
Jun 03, 2026

Issue With Opening Browsers After Windows Update

Update was done on Monday. Since then, we are unable to go to certain websites, we get an ERROR 505 or just a blank, white page while it shows the page is loading, it just never does load. 
I tried to uninstall the update to go back to normal, but Windows now says there are no updates to uninstall. I have gotten an IT guy involved and he tried to solve it as well but he says it must be a bug in the Windows update as everything was fine until the update happened. 

I have tried the following...note that I also restarted the computer after each attempt to fix this issue:

  • Uninstall the updates (cannot uninstall them though)
  • ran my antivirus
  • ran the computer in safe mode
  • cleaned out the cache, browsing history, downloads and cookies
  • uninstalled firefox and google chrome then reinstalled them
  • troubleshoot Windows
  • troubleshoot Microsfot Exchange
  • modify/fix Microsoft Exchange
  • tested internet connection
  • tested that the websites were not down or having issues (they were not)
  • tested the websites on different computers (they are all on Windows 11 - no issues)

    Nothing has worked. 
    Still error 505 or just a blank page.

    the system is a Windows 11
    The other two computers are fine (we did not update them). 
    HELP!
configuration
Update management

2 Replies

  • Jamony's avatar
    Jamony
    MCT
    Jul 11, 2026

    Hi, since this started right after a Windows update and affects multiple browsers, I would first check network and security layers rather than reinstalling each browser. Test with a different network, temporarily disable any VPN/proxy/web filtering tool, and run the same sites in InPrivate mode. Also reset the network stack and DNS cache, then install the latest network adapter driver from the device manufacturer. If only certain HTTPS sites fail, check date/time, TLS inspection, antivirus web protection, and any company firewall rules.

  • Jamony's avatar
    Jamony
    MCT
    Jul 10, 2026

    Hi, HTTP 505 from several browsers on only one PC points more toward a local proxy, VPN, web-filter driver, or security product than browser cache. Check Settings > Network & internet > Proxy and run netsh winhttp show proxy. Temporarily disable any VPN or antivirus web shield, and test the same site in a new Windows user profile. Also inspect the browser developer tools Network tab to see which server returns 505. Update or reinstall the PC's network driver from the manufacturer. If Safe Mode with Networking works, use a clean boot to identify the filter. The exact update KB and affected URLs would help narrow this down.