Fail2ban 2011/10/25, Rafael Pereira de Abreu <raf...@ic.uff.br>: > EHLO > > Our host was recently added to a blacklist. I watched the logs below: > > 10-24 12:05:15 CHKUSER relaying rcpt: from > <ch50...@zing.vn:lgoncal...@ic.uff.br:> > remote <User:unknown:216.24.194.84> rcpt <hac...@yahoo.com> : client allowed > to > relay > 10-24 12:05:15 policy_check: local lgoncal...@ic.uff.br -> remote > hac...@yahoo.com > (AUTHENTICATED SENDER) > > I understand that someone logged into the host and used as a relay. I'm > searching > the internet the following questions: > > 1) How to force users to utilize strong passwords? > > 2) Is there a way to avoid this kind of attack? > > 3) Are there any warning for increasing message queue or simultaneous > connections? > > 4) You can block attempts to break password brute force? > > I thank first of all and I go searching. > > -- > Rafael Pereira de Abreu Rosa > Técnico de Suporte a Sistemas <http://suporte.ic.uff.br> > Instituto de Computação - UFF (Fluminense Federal University - Brazil) > Tel: (21) 2629-5664 > Cel. (21) 8798-9057 > > -------- > > > > --------------------------------------------------------------------------------- > Qmailtoaster is sponsored by Vickers Consulting Group > (www.vickersconsulting.com) > Vickers Consulting Group offers Qmailtoaster support and installations. > If you need professional help with your setup, contact them today! > --------------------------------------------------------------------------------- > Please visit qmailtoaster.com for the latest news, updates, and > packages. > > To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com > For additional commands, e-mail: > qmailtoaster-list-h...@qmailtoaster.com > > >
-- Enviado desde mi dispositivo móvil --------------------------------------------------------------------------------- Qmailtoaster is sponsored by Vickers Consulting Group (www.vickersconsulting.com) Vickers Consulting Group offers Qmailtoaster support and installations. If you need professional help with your setup, contact them today! --------------------------------------------------------------------------------- Please visit qmailtoaster.com for the latest news, updates, and packages. To unsubscribe, e-mail: qmailtoaster-list-unsubscr...@qmailtoaster.com For additional commands, e-mail: qmailtoaster-list-h...@qmailtoaster.com