I am getting this error even with httpd.admin enabled; tls is enabled as well.
perl hello_ontapi.pl filer03 api 'xxx'
Failed: Server returned HTTP Error: 503 Administrative
httpd.access legacy
httpd.admin.access legacy
httpd.admin.enable on
httpd.admin.hostsequiv.enable off
httpd.admin.max_connections 512
httpd.admin.ssl.enable on
httpd.admin.top-page.authentication on
httpd.autoindex.enable off
httpd.bypass_traverse_checking off
httpd.enable on
httpd.ipv6.enable on
httpd.log.format common (value might be overwritten in takeover)
httpd.method.trace.enable off
httpd.rootdir /vol/vol0/home/http
httpd.timeout 300 (value might be overwritten in takeover)
httpd.timewait.enable off (value might be overwritten in takeover)
ssh1.enable off
ssh2.enable on
ssl.enable on
ssl.v2.enable on (same value required in local+partner)
ssl.v3.enable on (same value required in local+partner)
tls.enable on (same value required in local+partner)