Not getting latest Windows Defender definitions through Windows Update

Up until today I always got the latest Defender definitions via Windows Update. Today however, WU told me my PC was "Up to date", but checking Microsoft Malware Protection Center told me my definitons were from yesterday. I tried updating through Windows Defender itself and it updated to the latest definitons.

Did anyone else experience this or is something wrong with my Windows Update? Until yesterday it worked fine and I didn't change anything.

Edit: Running 1703

I've been having this issue with both my desktop (running 1703) and my dads netbook (running 1607) so I think it's a ms issue

While Microsoft are known to update their definitions two-hourly, these are only delivered to their business Enterprise customers for their servers to use. The Retail definitions are updated less frequently. There's no regular pattern, but usually a new one is issued at least once a day. Sometime there's a longer gap, so it may appear that windows update has stopped working. It hasn't - there are just no new definitions available yet.

The latest version of the definitions available through windows update is 1.245.1157.0 and was issued about five hours ago.

This was recently discussed in more detail here...

Windows Defender Threat Definitions Update?

Bree said:

The latest version of the definitions available through windows update is 1.245.1157.0 and was issued about five hours ago.

I was not able to update to 1.245.1157.0 through Windows Update. It kept telling me my PC was up to date after searching for updates. Only updating through Windows Defender itself worked.

New definitions were definitely available but Windows Update did not find them. Thats what I'm concerned about.

Dencibo said:

Only updating through Windows Defender itself worked.

Then you may have a windows update problem after all. Try running the 'Windows Update Troubleshooter'. Find it in Settings > Update & Security >Troubleshoot (or type Troubleshoot in the Cortana/Search box on the taskbar).

Bree said:

Then you may have a windows update problem after all. Try running the 'Windows Update Troubleshooter'. Find it in Settings > Update & Security >Troubleshoot (or type Troubleshoot in the Cortana/Search box on the taskbar).

Did that and also sfc /scannow, no errors. I also uninstalled the latest Flash Security update just to see if Windows Update works correctly. It found the update again and reinstalled it without problems.

So could this be an issue on Microsofts side?

i should say i did an in-place upgrade this to resolve this and other non related issues on my desktop PC and i'm still having this issue. Update did however sucessfully download and install the last cumlative update though as shown here:

Dencibo said:

So could this be an issue on Microsofts side?

We are in different countries. I've noticed that sometimes it takes time for newly released updates to replicate across all Microsoft's update servers.

the issue for me started monday then tuesday during the day windows update was finding and downloading them but int he evening going into today it started playing up again

shadowblade said:

...today it started playing up again

@shadowblade, this tutorial may help...

Reset Windows Update in Windows 10

...though following it will clear your update history.