The username I used was indeed "elhambre", so that's not the issue. I was thinking, when I refereed to a possible server-side issue, to a problem in my entry within the OpenSSH config file, assuming that's what you're using... Besides my failed attempts with FileZilla, I also tried this test with the sftp command, both directly (via my ISP) and via a VPN (to somewhat ruleout port 1373 filtering.)
export SSHPASS=myUserPwd
sshpass -e sftp -oPort=1373 elhambre@johnny.heliohost.org:$HOME_DIR/public_html/myFile.xyz
The response output in both cases was the usual:
ssh: connect to host johnny.heliohost.org port 1373: Connection timed out
Connection closed
Thanks for any other suggestion/test/etc... -elhambre