Bug ID 431076: Windows 8.1 can crash if you delete urfltv64.sys file.

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP APM(all modules)

Known Affected Versions:
10.2.4, 11.2.1, 11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2, 11.4.0 HF6, 11.3.0 HF9, 11.2.1 HF10, 10.2.4 HF8

Opened: Sep 18, 2013
Severity: 3-Major
Related AskF5 Article:


If you delete the file %systemroot%\system32\drivers\urfltv64.sys Windows can crash when establishing VPN connection.


May result in crash of Windows OS


User manually deletes %systemroot%\system32\drivers\urfltv64.sys


Do not delete driver manually.

Fix Information

Driver installer fixed to re-install client stonewall driver independently from VPN driver.

Behavior Change