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Forum Discussion

baumwe

Copper Contributor

Sep 28, 2022

Defender not updating - ValidateMapsConnection failed to establish a connection to MAPS

Microsoft Defender is not updating. When I click "Check for updates" in the window "Windows Security / Virus & threat protection" under "Virus & threat protection updates", Defender searches for upd...

microsoft defender for endpoint

HeikeRitter

Microsoft

Sep 28, 2022

baumwe Based on the error code you get (httpcode=451), it looks like the URL’s here are being SSL inspected by your Proxy/Firewall.
If you think that these URL's above are already excluded from SSL inspection, I suggest to open a support ticket

baumwe
Copper Contributor
Oct 04, 2022
I could check now. Other computers behind the same Firewall are working smoothly. The error occours only on one computer. I completely deactivated the software firewall on that computer but that didn't help.
- HeikeRitter
  Microsoft
  Oct 04, 2022
  If this is really just one device, you will need to do more troubleshooting or contact our support. Did you have a look at the docs page will lots of troubleshooting scnearios? https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/troubleshoot-onboarding?view=o365-worldwide
baumwe
Copper Contributor
Sep 30, 2022
Thank you HeikeRitter, I will verify that an post here again when I know more.