SOLVED - Sometimes you might get an error saying Unexpected EOF in SOAP message when trying to run a graph (starting the ETL Runtime).
This problem might be caused by ESET Antivirus software, particularly ESET's protocol filtering feature. To fix this, either:
OPTION 1: Disable protocol filtering in ESET
Setup > Enter Advanced Setup > Web and email / Protocol Filtering > uncheck "Enable application protocol and filtering")
OPTION 2: Add exception in ESET
Setup > Enter Advanced Setup > Web and email / Protocol Filtering > Excluded Applications
Add exception for "javaw.exe" used by Designer (e.g. "C:\Program Files\CloverETL Designer\jdk1.7.0_51_64\bin\javaw.exe")
This applies to CloverETL 4.0.x