- Gaming and consoles
- PC games and launchers
BLZBNTBNA0000000C
Battle.net BLZBNTBNA0000000C on PC: digital signature cannot be verified
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
The Battle.net app cannot recognize its digital certificates (BLZBNTBNA0000000C), usually because it is corrupted. Restart the PC and, if it persists, uninstall and reinstall the Battle.net app.
Safety first
Stop and check this first
- Download Battle.net only from Blizzard's official website: the error is about a digital signature that cannot be verified, and an installer from another source does not solve that.
Safe checks you can perform
- Restart and reinstall Battle.net
- Security software exceptions
- Windows and driver updates
- New Windows administrator account
Leave these tasks to a qualified professional
- Do not attempt this professional task: Blizzard technical support
- Do not attempt this professional task: Antivirus maker support
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Blizzard technical support
What they doIf the error persists after reinstalling, adding the exception, updating and trying another administrator account, Blizzard support reviews the case.
They must show youthe ticket number and their diagnosis.
In writingthe code, the antivirus you use and the steps already tried.
Antivirus maker support
What they doIf the antivirus keeps blocking Battle.net after you add the exception, its maker explains how to allow Blizzard applications in that product.
They must show youthe exception applied.
In writingwhich rule was added and for which files.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Restart and reinstall Battle.net
- Who:
- you.
- How:
- restart the PC and open Battle.net. If the error returns, uninstall the Battle.net app from Windows Apps and reinstall it from Blizzard's website.
- Result that matters:
- whether the signature verifies after the restart or with the app reinstalled.
- If it works after reinstalling:
- the app was corrupted, the cause Blizzard calls usual.
- If it stays:
- check your security software.
- Evidence to keep:
- a screenshot of the message with the code and the reinstall date.
Evidence: BLZBNTBNA0000000C
Security software exceptions
- Who:
- you.
- How:
- open your antivirus or firewall and add Blizzard applications to its exception list, following the software maker's help.
- Result that matters:
- whether Battle.net opens with the exception in place.
- If it opens:
- security software was blocking Battle.net's verification.
- If it stays:
- update drivers and the operating system.
- Evidence to keep:
- a screenshot of the exception created.
Evidence: BLZBNTBNA0000000C
Windows and driver updates
- Who:
- you.
- How:
- install pending updates in Windows Update and the latest drivers for your PC from its maker; restart.
- Result that matters:
- whether the error goes away with the system up to date.
- If it goes away:
- there was a system or driver incompatibility.
- If it stays:
- try a new administrator account.
- Evidence to keep:
- the Windows version after updating.
Evidence: BLZBNTBNA0000000C
New Windows administrator account
- Who:
- you (or whoever manages the PC).
- How:
- create a new local account with administrator rights, sign in to it and open Battle.net.
- Result that matters:
- whether Battle.net works on the new account.
- If it works:
- the problem was permissions on your usual Windows account.
- If it fails there too:
- the case is for Blizzard support.
- Evidence to keep:
- the result on each Windows account.
Evidence: BLZBNTBNA0000000C
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Gaming and consoles
- Brand
- Battle.net
- Product type
- PC games and launchers
Known code variants
- Battle.net digital signature
- BLZBNTBNA0000000C Battle.net
- error BLZBNTBNA0000000C
- No pudimos verificar la firma digital de tu agente Battle.net
- We couldn't verify the digital signature of your Battle.net Agent
What it means
Blizzard says BLZBNTBNA0000000C occurs when the Battle.net desktop app cannot recognize its digital certificates; the message says the digital signature of the Battle.net Agent could not be verified. Blizzard says it usually happens because the app has become corrupted. Its steps also point to security software, outdated drivers or system and Windows account permissions. The code does not mean a problem with your Battle.net account.
Warnings and stop conditions
- Loweditorial warning
Download Battle.net only from Blizzard's official website: the error is about a digital signature that cannot be verified, and an installer from another source does not solve that.
Evidence: BLZBNTBNA0000000C
Symptoms and causes
Probable causes · in order
- Corrupted Battle.net appCommon
This is the usual cause according to Blizzard. It is confirmed if the error goes away after uninstalling and reinstalling the app.
Evidence: BLZBNTBNA0000000C
- Security software blocking BlizzardPossible
Blizzard asks you to configure the security software's exception list. Suspect it if the error appeared after installing or updating an antivirus.
Evidence: BLZBNTBNA0000000C
- Outdated system or driversPossible
Blizzard says to update drivers and the operating system to resolve compatibility issues. Suspect it if updates are pending.
Evidence: BLZBNTBNA0000000C
- Windows account permissionsPossible
Blizzard suggests creating a new administrator account. It is confirmed if the app works on that account.
Evidence: BLZBNTBNA0000000C
Virtual technician
Does BLZBNTBNA0000000C still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Blizzard Entertainment · 2026 · official_doc
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