modified: /var/run/td-agent 0755

Hi, we need 0755 permission in home_dir?
in this case
http://docs.treasuredata.com/articles/php#modifying-etctd-agenttd-agentconf

my env: AWS
error:
[Thu Sep 11 17:44:16 2014] [error] [client 124.35.160.2] Fluent\\Logger\\FluentLogger stream_socket_client(): unable to connect to unix:///var/run/td-agent/td-agent.sock (Permission denied)