Why Windows 10 Update cannot connect to its update servers even though there is a working internet connection?

Screenshot of Windows 10 Update unable to connect

About my setup

  • Running Windows 10 on a PC behind a dedicated firewall (pfsense 2.2.5)
  • There is internet connectivity, port 80 / 443 works fine for anything else
  • Connecting the Windows 10 PC directly to my ISP's modem allows to update Windows 10 => suggests that the firewall is causing the problem

Already checked

Still, Windows 10 (version 1511) cannot update itself when I run it behind my firewall.

Any other suggestions/ideas?

  • 1
    If you feel like down-voting my question then also feel free to leave a comment why. This problem kept me busy investigating and trying out different things for some time - and there was no obvious fix or google answer to begin with.
    – Ivo Mori
    Dec 19, 2015 at 12:24
  • Hmm... Maybe I need to try out that firewall...
    – Andrew
    Aug 11, 2018 at 22:12

1 Answer 1


Answering my own question.

I found the Windows Update Troubleshooter for Win10 from MS.

While running it, it in fact found and fixed a problem. After that, my Windows 10 can update itself now (great).

So, even though everything suggested a problem with my pfSense firewall it was some problem with the Windows Update itself.

  • Glad you resolved the problem.
    – Moab
    Dec 19, 2015 at 23:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.