To correct this, you can add "-noSsl" option to your command like this:
servermonitor.exe -noSsl -username ccmssvc -password buyer! -host corp-aribaap -partition None -runtask <taskName>
Looks like this issue is resolved, so I'm marking it as "Assumed Answered".
Vijay, please keep the question open (and let me know) if it's not resolved.