Just want to add that 2 of my clients ran into the same issue recently. Turns out the culprit is that Network.dll had not been properly upgraded. After running component upgrade from ERA 6.2 to 6.3, Network.dll is still 6.2 version, causing 6.3 service to crash. I took the dll from a working 6.3 installation, replaced it, and viola service starts working properly.
Attached is the list of files in C:\Program Files\ESET\RemoteAdministrator\Server from a working 6.3 installation, might want to check this first in case someone else run into the same issue.
Adding to RyanTsai's solution:
Since I do not have an additional working 6.3 installation, I downloaded the ESET ERA Standalone component server installer (in my case Server 2012R2) Server_x64.msi
Extracted the contents of the .msi to a folder. Example: msiexec /a C:\temp\Server_x64.msi /qb TARGETDIR=C:\temp\Extracted On the ERA server, rename the old Network.dll to Network.old Copy the newly extracted Network.dll to C:\Program Files\ESET\RemoteAdministrator\Server Started the ESET Remote Administrator Server Service
Have not experienced anymore issues
