Hi, For us to understand you better, Please answer the following questions!! Have you installed the Firewall i.e. Network threat protection? Which version of endpoint have you installed? Also the operating system of the computer if NTP is installed and is enabled? Also please try if any of the article matches your need!! >>Ping response time increase with Symantec Endpoint Protection Maintenance Release 4 (SEP MR4) with Network Threat Protection compared to SEP MR3 http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2009012711494548 >>Slow ping times on Windows Vista with Symantec Endpoint Protection 11 installed and Network Threat Protection enabled. http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008042811212248