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.
This problem is fixed in Symantec Endpoint Protection 12.1 Release Update 3 (12.1 RU3). For information on how to obtain the latest build of Symantec Endpoint Protection, read ‘Obtaining the latest version of Symantec Endpoint Protection or Symantec Network Access Control’
If it is not immediately possible to upgrade, work around this problem by using one of the following:
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