Use the following steps to manually install the Symantec Endpoint Protection (SEP) client firewall driver (teefer2.sys). This process is not necessary during a normal SEP client installation or upgrade.
Locate teefer.inf and teefer.sys
Windows driver files are installed using a driver install file (.inf). To install the SEP client firewall driver, locate the teefer.sys driver file and its corresponding install file, teefer.inf.
Use the following table to locate the teefer.sys and teefer.inf files on a computer where the SEP client is already installed: