Error code

0x800705b4

This code is covered here in Windows Update. It does not identify internet access as the only cause: an update taking too long also needs its own state checked.

Windows Update error 0x800705b4

The update took too long or was interrupted. Retry after a normal restart and check connectivity before attempting advanced repairs.

Try this first

1 quick checks · ~5 min

Restart and retry after the attempt has failedDo not turn the computer off while installation is still active.

Step-by-step solutions

Restart and retry after the attempt has failed

Estimated time: 5 min
Easy
Low risk
Restart required

Do not turn the computer off while installation is still active.

If Windows has reported the error and the desktop is usable, save work and restart normally. Return to Windows Update and retry once.
Use a stable connection and check whether other sites or apps also lose internet access. If connectivity works, do not change DNS based on this code alone.

Sources:

Microsoft Support

Run the Windows Update troubleshooter

Estimated time: 10 min
Easy
Low risk

Check whether the same update keeps failing.

Open the Windows Update troubleshooter available for your version through Settings or Get Help. Review proposed changes before accepting them.
Retry once it finishes. If only one update fails, keep its identifier for support; if other apps also lose internet, address connectivity first.

Sources:

Microsoft Support

Next step

Still not working?

If 0x800705b4 returns on a stable connection, contact Microsoft with the affected update and troubleshooter result. Do not repeatedly force restarts or disable protection to speed up installation.

Sources

Documentation behind this guide. Editorial recommendations are identified separately.

Microsoft SupportOfficialTroubleshoot problems updating Windows

Source review: September 11, 2026. A documentation review, not a physical hardware test.