Virus definition not updating
Step 4) Cleanup the Live Update Catalog and Re-register SEPM with Live Update.Open a command prompt and change directory to the following path (or the relevant path for the current installation).This can be done by locating the log.liveupdate file on the computer.
Step 6) Proxy Settings For environments with a corporate proxy, allow HTTP port 80 or FTP ports 20, 21 and port 443 connections to these hosts: liveupdate.liveupdate.update.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.
Verify the version of Live Update reflects the version you have installed on SEPM.
Please proceed to Step 4, if the correct version is shown.
Your computer will now check for any and all available updates.
In the Win X Menu, click on Command Prompt (Admin) to open an elevated Command Prompt.
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.