alert tcp $HOME_NET 513 -> $EXTERNAL_NET any (msg:"GPL RPC rlogin login failure"; flow:from_server,established; content:"|01|rlogind|3A| Permission denied."; reference:arachnids,392; classtype:unsuccessful-user; sid:2100611; rev:8; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)