On Thursday 29 January 2004 07:28, Reuben D. Budiardja wrote: > Hi all, > I'm wondering if someone can help me interpret this. I got lots of > this in my maillog: > .. > 1958:Jan 27 05:52:03 voyager sendmail[13700]: i0RAq3413700: > <peter@xxxxxxxxxxxxxxxxxxxx>... User unknown > > and (sometimes) correspondingly in the next line the following also > exist: > > jan 27 05:36:58 voyager sendmail[13585]: i0RAaw413585: lost input > channel from adsl-66-73-195-63.dsl.chcgil.ameritech.net > > What is the "lost input channel" mean? Does this mean someone try > to probe what user exists on my server? should I be worried? > The explanation I've seen is that the remote side just drops the connection when after issued the error message "User unknown" rather than issue the "QUIT" instruction to shut down the connection gracefully. Spammers do this all the time in order to save time; drop the connecton and move on to the next victim. Regards, Mike Klinke -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
