Virus definitions are out of date on the Symantec Endpoint Protection Manager (SEPM), and this is affecting the Symantec Endpoint Protection (SEP) clients to which it provides content.
As a best practice, ensure that the SEPM is upgraded to the very latest release of Symantec Endpoint Protection 12.1.
The issue causing the update issue may be resolved by the improved processing and enhanced features available in a software version later than what is running.
Most common reasons for update failure:
Symantec Endpoint Protection Manager definitions are corrupted;
LiveUpdate is unable to access / read the LiveUpdate catalogue file;
An incorrect or incompatible LiveUpdate client version is installed on the server;
A proxy server is preventing LiveUpdate to connect properly to Symantec LiveUpdate servers, or is modifying the files that must be used
Note that IP address obtained by DNS resolution, should not be used, as this may be subject to change due to system updates and load balancing. It is highly recommended that the provided host names are used.
Disable content caching and AV scan in the proxy for those connection to avoid corruption of the definition files.
Step 7) Monitor System
Allow 24 hours to verify that LiveUpdate is now working properly. Monitor the system for a few days to ensure that updates are downloaded and installed properly.
Windows Server Symantec Endpoint Protection 12.1
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