« Posts under distributed denial-of-service

Hardening Sendmail – supplement

March 31, 2009 / posted in Configuration, denial-of-service, distributed denial-of-service, mail-server, security, Sendmail, server / No Comments

In my I wrote about hardening sendmail against DDoS-Attacks. As someone has pointed out to me, I have missed an important option: 1 define(`confMAX_DAEMON_CHILDREN’, `<em>count</em>’)dnl define(`confMAX_DAEMON_CHILDREN’, `<em>count</em>’)dnl This option defines the maximum number of sendmail-processes allowed, before sendmail start rejecting incoming connections with a temporary error. count should be chosen with great care. I recommend [...]

Hardening Sendmail against DDoS

March 29, 2009 / posted in Configuration, denial-of-service, distributed denial-of-service, mail-server, security, Sendmail, server / 5 Comments

For some time now, I was experiencing a strange behavior of my server: from time to time, without an ascertainable pattern, the server would stop reacting to network-requests. The teamspeak-server, which runs on it, would kick anyone connected to it, and nothing particular special could be found in the logs. When this happened last Thursday, [...]