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When Battle.net will not sign in, hangs while updating, or repeatedly fails to download a game, start with the exact symptom and any displayed error code. A login failure, a launcher or Agent update failure, and a game-file transfer failure have different causes and different fixes. Work through the matching branch below before deleting files or reinstalling the app.

Start with the symptom, not a random fix

Battle.net problems usually fall into four separate categories. Identifying the category prevents you from treating an account problem as a damaged installation or a disk-write problem as an internet outage.

What you see Most relevant area First action
You cannot authenticate or the app rejects sign-in Account, BattleTag, server response, or network path Record the exact message and check the account before changing launcher files.
The desktop app will not start or remains on an Agent update Battle.net Agent process, permissions, security software, or conflicting applications Close Battle.net, confirm its Agent process has ended, then reopen it.
A game download or patch stops with an error Connection, required download file, game data, or security software Restart the app and Agent, then check the connection and repair the affected game.
The app reports that it cannot write patch files Free space, folder permissions, security software, or another program holding a file Check storage and permissions before considering hardware replacement.

Write down the complete error code, capitalization included. Codes such as BLZBNTBNA00000A8E, BLZBNTAGT000008A3, BLZBNTBTS00000034, and BLZBNTBNA00000006 identify different failure paths. If a code is visible, use its specific branch instead of repeating a generic reinstall.

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The guidance summarized here comes from Blizzard support material for the United States site and global error articles. Support instructions and service conditions can change, and regional account or network behavior may differ. No live outage check is assumed here.

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Fix Battle.net sign-in and account-access errors

BLZBNTBNA00000A8E

Blizzard describes BLZBNTBNA00000A8E as a response returned by the server or as an indication that the account does not have a correctly set BattleTag. The code does not, by itself, prove that your local Battle.net installation is corrupt.

  1. Open your Blizzard account management page through a browser and confirm that the account has a BattleTag configured correctly.
  2. Try the same sign-in on a different network, such as a phone hotspot, only long enough to isolate the connection. If the alternate network works, the original internet provider or network path is a stronger suspect than the launcher files.
  3. Close Battle.net completely and start it again after the account check.
  4. If the problem appears to be a rare launcher-specific fault, reinstall the desktop app after the account and network checks, rather than as the first response.
  5. If permissions remain suspect, test with a new administrator account on the computer. Use this as a diagnostic comparison, not as a permanent workaround unless you understand the account and security implications.

An administrator test can show that the original Windows profile has a permissions or configuration problem, but it does not repair the original profile automatically. Return to the normal account after testing and apply only the smallest necessary change.

When you have lost access to the account

Email recovery and password reset are separate self-service routes in Blizzard’s support results. Use the recovery option that matches the missing credential. Deleting the Battle.net Tools folder, repairing a game, or reinstalling the launcher cannot recover an account whose email or password you cannot use.

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Keep account recovery separate from launcher troubleshooting. Once you can authenticate in a browser, retry the desktop app. If browser access works but the desktop app does not, continue with the local-app and network branches rather than repeatedly resetting the password.

Resolve an app that is stuck updating or will not start

Restart the Battle.net Agent cleanly

The desktop app relies on a background Agent to install and patch games. A stalled Agent can leave the window on an update message such as “Stuck at Updating Battle.net Agent.” A restart is useful only if the old process has actually ended.

  1. Exit Battle.net from its window and notification-area menu.
  2. Open Task Manager and look for the Battle.net Agent process, commonly shown as Agent.exe.
  3. Wait until the Agent process disappears. If it remains, end the relevant Battle.net process in Task Manager.
  4. Reopen Battle.net and allow the Agent to initialize before starting a game download.
  5. If the process repeatedly returns or the app still cannot update, restart the computer and try once more.

Do not launch several copies of the app while an old Agent is still running. Multiple competing processes can make a lock or permission problem look like a download failure.

Check software conflicts and security controls

Blizzard’s Agent and installer guidance includes closing conflicting applications and configuring security software to allow Blizzard applications. Temporarily disabling protection without understanding the risk is not a complete fix; the safer approach is to create the appropriate allow or exception entry in the security product you manage, then restore normal protection.

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  • Close overlays, system-tuning tools, and other programs that may hold game or launcher files open.
  • Check firewall, antivirus, and endpoint-security notifications for a blocked Blizzard process.
  • Allow the Battle.net desktop app, Agent, and the affected game through the security controls required by your setup.
  • Retry the update after making one change at a time so you know which change mattered.

If the update succeeds after an exception, keep the exception narrowly scoped and review it when the security software or Battle.net installation changes.

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Fix a failed game download or patch

BLZBNTAGT000008A3

BLZBNTAGT000008A3 means the app could not download a file required for installation or patching. Blizzard’s documented sequence starts with the Agent restart, then moves to connection, game-file repair, and security checks.

  1. Close Battle.net and wait in Task Manager for Agent.exe to disappear.
  2. Reopen the app and retry the download.
  3. If it fails again, restart the computer and retry.
  4. Check that the computer is still connected and that other devices or applications are not consuming or interrupting the connection.
  5. Use Battle.net’s repair option for the affected game to check and replace damaged game data.
  6. Check security software and firewall rules for blocked Blizzard applications, then retry.

A failed required-file download is not automatically evidence of a bad drive. It can result from a transient connection path, a blocked process, a damaged local game file, or an Agent that did not restart cleanly.

When the download is slow without a code

Separate “slow” from “failed.” A transfer that continues, even slowly, points first to the connection path or another application using bandwidth; a transfer that stops with a code should follow that code’s branch. Pause other large transfers, confirm that the connection is stable, and retry after the Agent restart. If an alternate network changes the result, record that fact for support rather than repeatedly reinstalling the launcher.

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Watch whether the rate is consistently low or repeatedly drops to zero. A fluctuating rate can reflect congestion or competing traffic, while a repeatable stop at the same point is more useful evidence of a blocked file, damaged data, or a permission problem. Avoid changing several network and security settings at once; otherwise you will not know which condition allowed the transfer to resume.

Handle patch write errors without replacing hardware prematurely

BLZBNTBTS00000034

BLZBNTBTS00000034 indicates that Battle.net could not write patch files. Blizzard’s recommendations focus on storage, permissions, security software, and conflicting applications.

  1. Check the destination drive’s free space. A patch may need room for temporary and final files, so do not wait until the drive is completely full.
  2. Confirm that the Windows account and Battle.net have permission to write to the game and launcher folders.
  3. Check security software for a blocked write operation and allow the relevant Blizzard applications when appropriate.
  4. Close applications that may be using the same game files, then retry the patch.
  5. Use the game’s repair function if the patch continues to fail after the write conditions are corrected.

Blizzard explicitly advises not to defragment an SSD. A write error alone is not proof that a drive needs replacement. Investigate available space, access rights, file locks, and security controls first; only a broader pattern of drive errors or operating-system warnings justifies a separate storage-health investigation.

Check the actual installation volume rather than assuming the drive containing Windows is the destination. If several games are installed on different volumes, a write error affecting one title can be local to that folder even when other games update normally. Note the affected path when you contact support.

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Rebuild missing Battle.net Agent files

BLZBNTBNA00000006

BLZBNTBNA00000006 concerns missing Agent files. Blizzard’s guidance begins with ordinary system maintenance and reserves file deletion and operating-system changes for advanced troubleshooting.

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  1. Restart the computer.
  2. Install available driver and operating-system updates, then restart if required.
  3. Close applications that may conflict with the launcher or keep its files open.
  4. Scan for malware using the security tools appropriate for your system.
  5. Check antivirus and firewall exceptions for Blizzard applications.
  6. If the error persists, close Battle.net and delete the Battle.net Tools folder so the app can rebuild it when launched again.
  7. Reinstall the Battle.net desktop app if rebuilding the Tools folder does not restore the Agent.
  8. Only as an advanced Windows step, follow Blizzard’s current instructions for resetting the Windows Management Instrumentation (WMI) repository.

Deleting the Tools folder removes launcher components that Battle.net is designed to recreate; it is not an account-recovery method and should not be confused with deleting installed game data. The WMI repository reset changes an operating-system component. Use it only when the documented simpler steps have failed, follow Blizzard’s complete current procedure, and do not improvise commands from an old guide.

After a rebuild or reinstall, verify that the desktop app can start before launching a large game download. If the Agent disappears again immediately, capture that behavior and the exact code rather than repeatedly deleting the same folder. Repetition without a new observation rarely distinguishes a permissions issue from a security block.

A safe order for troubleshooting when no code is shown

If the app gives only a generic message, use this order. Stop as soon as the symptom is resolved.

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  1. Capture the symptom. Note whether the failure is sign-in, app startup, Agent update, game download, patching, or writing files. Record the exact text and time.
  2. Restart once, completely. Exit Battle.net, wait for Agent.exe to end, and reopen. Reboot the computer if the process will not clear.
  3. Check account access separately. If browser account access fails, use email recovery or password reset. If browser access works, do not keep resetting credentials for a desktop-only problem.
  4. Test the connection. A different network can distinguish an internet-provider path problem from a local launcher problem. Treat the result as a diagnostic clue, not proof of a permanent outage.
  5. Check protection and permissions. Review firewall, antivirus, endpoint-security, and folder access controls. Close conflicting programs.
  6. Repair only the affected game. Use the built-in repair option when a patch or download fails, rather than removing every installed game.
  7. Use advanced rebuilding steps last. Delete the Tools folder, reinstall the app, or reset WMI only after the basic checks and only when the symptom matches that branch.

Choose the right branch instead of repeating a reinstall

Evidence Likely branch What to document
Browser account access fails Account recovery Whether email recovery or password reset restores access.
Browser works, desktop sign-in returns BLZBNTBNA00000A8E BattleTag, server response, or network path BattleTag status and result on an alternate network.
Agent remains after the app is closed Local process or conflicting software Whether ending the Agent or rebooting changes the result.
BLZBNTAGT000008A3 appears during a patch Required-file download, connection, game data, or security exception Agent restart, connection check, repair result, and security action.
BLZBNTBTS00000034 appears while writing Space, permissions, file lock, or security control Free space, destination permissions, and conflicting applications.
BLZBNTBNA00000006 appears Missing Agent files Updates, malware scan, exceptions, Tools-folder rebuild, and reinstall result.

This comparison is a decision aid, not a promise that one cause is certain. The same visible symptom can have more than one cause, which is why documenting the result of each change matters.

There is no general hardware, router, drive, or security-product purchase implied by these branches. The documented checks focus on account state, software processes, connection conditions, permissions, and game files. Consider a separate hardware investigation only when the computer shows other storage or operating-system failures outside Battle.net.

When to contact Blizzard support

Escalate when the error-specific steps fail, the code returns after a clean restart, or the result changes between networks without a clear explanation. Blizzard’s error pages direct unresolved cases to its technical-support forums or support channels.

Include a concise diagnostic record:

  • Operating-system version and whether it is fully updated.
  • The exact Battle.net error text and code, copied rather than paraphrased.
  • Whether the problem affects sign-in, the launcher, one game, or every game.
  • Whether browser account access works.
  • Whether an alternate network changes the result.
  • Whether Agent.exe disappeared before reopening the app.
  • Which documented steps you completed, including repair, security exceptions, Tools-folder rebuilding, or reinstalling.

Do not repeatedly reinstall without recording what changed. A support technician can use the code and this sequence to distinguish an account, network, permissions, Agent, or game-file problem more quickly.

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Practical cautions

  • Do not treat a sign-in code as proof that all launcher files are damaged.
  • Do not delete game folders when the documented step concerns the Battle.net Tools folder.
  • Do not defragment an SSD to address a patch write error.
  • Do not leave security protection disabled as a permanent workaround; use a narrowly scoped exception and restore normal protection.
  • Do not perform a WMI repository reset until ordinary maintenance and the simpler Agent-rebuild steps have failed.
  • Do not infer that Battle.net is currently down from one failed login; no live regional outage status is established by these troubleshooting steps.

How to tell whether a test actually helped

Use one controlled change at a time and repeat the same action that originally failed. For example, if a patch stopped at a particular percentage, restart the Agent first and attempt that same patch again. If it succeeds only on a hotspot, record the network difference before switching back. If adding a security exception changes the result, keep the exception limited to the Blizzard components that were blocked and review it after future updates.

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A successful browser login rules out some account-credential problems but does not prove that the desktop app, Agent, or local network path is healthy. Similarly, one successful game repair does not prove that every installed title has intact files. Keep the scope of each conclusion as narrow as the test that produced it.

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Frequently asked questions

Should I reinstall Battle.net as soon as a download fails?
Usually not. Restart the app and wait for Agent.exe to end, restart the computer if needed, check the connection and security controls, and repair the affected game first. Reinstalling is a later step for persistent launcher-specific problems.

Does BLZBNTBNA00000A8E mean my installation is corrupted?
No. Blizzard associates this code with a server response or an account that lacks a correctly configured BattleTag. Check account management and try an alternate network before changing launcher files.

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What is the difference between a password reset and a launcher repair?
Password reset and email recovery restore account access. Repairing a game, rebuilding the Tools folder, or reinstalling the desktop app addresses local software and files; none can recover credentials.

Can I delete the Battle.net Tools folder without deleting my games?
The documented Agent-rebuild step targets the Battle.net Tools folder, not the folders containing installed games. Close the app first and follow Blizzard’s current instructions so the launcher can recreate its components.

Why does an alternate network matter?
It is a diagnostic comparison. If sign-in or downloading works on a different network, the original provider or network path becomes more likely. That result is evidence about the path, not proof of a permanent outage or a need to buy new networking equipment.

Is a write error a reason to replace my SSD?
Not by itself. For BLZBNTBTS00000034, check free space, permissions, security blocks, and applications holding files open. Blizzard specifically says not to defragment an SSD. Investigate hardware separately only if other drive or operating-system warnings are present.

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When should I use the WMI reset?
Only after restarting, updating, closing conflicts, scanning for malware, checking exceptions, rebuilding the Tools folder, and reinstalling have failed, and only by following Blizzard’s complete current procedure. It is an advanced operating-system change, not a routine download fix.

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What should I send support?
Provide the exact code and message, operating-system status, affected game or games, browser-login result, alternate-network result, whether the Agent ended, and the specific steps already attempted. This is more useful than saying only that Battle.net “doesn’t work.”

Bottom line

Match the remedy to the failure: verify the account for sign-in errors, restart the Agent for launcher and required-file failures, check space and permissions for write errors, and reserve Tools-folder deletion, reinstalling, and WMI changes for the appropriate advanced branch. Record each result and escalate with the exact code when the documented steps do not resolve the problem.

Frequently Asked Questions

Should I reinstall Battle.net as soon as a download fails?

Usually not. Restart the app and wait for Agent.exe to end, restart the computer if needed, check the connection and security controls, and repair the affected game first. Reinstalling is a later step for persistent launcher-specific problems.

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Does BLZBNTBNA00000A8E mean my installation is corrupted?

No. Blizzard associates this code with a server response or an account that lacks a correctly configured BattleTag. Check account management and try an alternate network before changing launcher files.

What is the difference between a password reset and a launcher repair?

Password reset and email recovery restore account access. Repairing a game, rebuilding the Tools folder, or reinstalling the desktop app addresses local software and files; none can recover credentials.

Can I delete the Battle.net Tools folder without deleting my games?

The documented Agent-rebuild step targets the Battle.net Tools folder, not installed game folders. Close the app first and follow Blizzard’s current instructions so the launcher can recreate its components.

Why does an alternate network matter?

It is a diagnostic comparison. If sign-in or downloading works on a different network, the original provider or network path becomes more likely. That result is evidence about the path, not proof of a permanent outage or a need to buy new networking equipment.

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Is a write error a reason to replace my SSD?

Not by itself. For BLZBNTBTS00000034, check free space, permissions, security blocks, and applications holding files open. Blizzard specifically says not to defragment an SSD. Investigate hardware separately only if other drive or operating-system warnings are present.

When should I use the WMI reset?

Only after restarting, updating, closing conflicts, scanning for malware, checking exceptions, rebuilding the Tools folder, and reinstalling have failed, and only by following Blizzard’s complete current procedure. It is an advanced operating-system change, not a routine download fix.

What should I send support?

Provide the exact code and message, operating-system status, affected game or games, browser-login result, alternate-network result, whether the Agent ended, and the specific steps already attempted.

The Bottom Line

Match the remedy to the failure: verify the account for sign-in errors, restart the Agent for launcher and required-file failures, check space and permissions for write errors, and reserve Tools-folder deletion, reinstalling, and WMI changes for the appropriate advanced branch. Record each result and escalate with the exact code when the documented steps do not resolve the problem.

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