At this time, there is a known workaround:
a) Delete the apachessluser database user as follows:
nhManageUsers -delete -user apachessluser
b) Re-run the nhWebProtocol command using the new passphrase.
Additionally, the issue documented above has been resolved in the following release:
eHealth 6.1 RTM and later
eHealth Service Packs are available for download at: Service Pack and Product Downloads. Please review the README file for each Service Pack prior to installing. CA recommends that users always keep eHealth current by installing the latest Service Pack available.