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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...
baumwe
We had a similar issue. This fixed it for us:
https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/configure-proxy-internet?view=o365-worldwide#configure-a-static-proxy-for-microsoft-defender-antivirus
Specifically this bit:
"If you are using static proxy setting on devices that are otherwise completely offline, meaning the operating system is unable to connect for the online certificate revocation list or Windows Update, then it is required to add the additional registry setting SSLOptions with a dword value of 0. Parent registry path location for "SSLOptions" is "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Spynet" "