LiveUpdate is not able to download the Antivirus and Antispyware definition updates, but content like Proactive Threat Protection is updated.
Manually starting LiveUpdate by clicking on "Start" and "Run" and typing "luall.exe", an Error LU1803 is received: "LiveUpdate failed while getting your updates"
LiveUpdate status in Symantec Endpoint Protection Manager shows "Error: LiveUpdate encountered one or more errors. Return code = 4"
Proxy server and firewall's with installed AntiVirus solution scanning files while downloading. LiveUpdate is running into a timeout condition and/or the downloads getting corrupt.
Add the Symantec LiveUpdate server domains in the trusted host list: