System hangs with Symantec Endpoint Protection Firewall when using third party application that uses 56k dial-out modem
Last Updated April 15, 2013
When using a third party dialing software that uses a 56k modem, it causes the system to hang whenever the Symantec Endpoint Protection (SEP) Firewall component (Network Threat Protection) is installed. The problem only occurs when NTP is installed on the system.
SEP's Teefer driver is not sufficiently backwards compatible with NDIS 4 and 5.0 packet allocation
The solution for this issue is contained in Symantec Endpoint Protection 12.1 RU2 MP1. Upgrade affected clients from SEP 12.1.2 to SEP 12.1.2 RU1 to take advantage of this fix and many other enhancements and improvements. For information on how to obtain the latest build of Symantec Endpoint Protection, read How to obtain an update or an upgrade for your Symantec corporate product.
As a workaround, should this not be immediately possible, disable SEP's firewall component and use Windows firewall.
Symantec Endpoint Protection 12.1.x
SEP client installed as an Unmanaged (Self-Managed) Client.
Imported Document ID: TECH185819
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