Computers experience network performance problems when the Network Threat Protection (NTP) firewall component of the Symantec Endpoint Protection (SEP) 12.1 Release Update 2 Maintenance Patch 1 (RU2 MP1) client is installed and enabled. Symptoms include:
This problem is caused by a performance issue introduced with the SEP 12.1 RU2 MP1 NTP firewall driver, teefer2.sys.
Symantec is aware of this problem and will update this document when a solution becomes available.
To work around this problem, use one of the following: