Antivirus unable to update definitions
4.5
The security software cannot download the latest list of known viruses.
Symptoms
- "Update Failed"
- "Definitions Outdated"
- Red status icon
Possible Causes
- No internet connection
- Server outage
- Malware blocking updates
Step-by-Step Fix
1
Check Internet
Ensure you can visit other websites.
2
Sync System Clock
Update servers often reject connections if your PC time is wrong.
3
Reinstall Antivirus
The update module itself might be corrupted.
When to See a Technician
Some advanced malware specifically blocks antivirus update servers to stay hidden.
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