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Bugcheck 139 Blue Screen referencing Teefer when undocking or disconnecting from VPN


Article ID: 172611


Updated On:


Endpoint Protection


When undocking a laptop from it's dock or disconnecting from a VPN, a blue screen (BSOD) with a Bugcheck 139 error referencing teefer.sys as the cause is seen occasionally.

BSOD with Bugcheck 139 on Teefer.sys


Windows 10
SSL VPN client Citrix Gateway Plug-in


This issue is resolved in Symantec Endpoint Protection 14.2 MP1. Upgrade the Symantec Endpoint Protection client to this version or higher to resolve the issue.