lappert2001 - 5:47 pm on Feb 25, 2012 (gmt 0)
Thanks for the reply. For the time being I've turned Shorewall off. I still don't know how to set up the rules to allow email traffic and webmin access, and turning it on/off was too much a hassle. (I know where the rules are ... just now what to put there)
And I still don't know what got this started. After we installed the new box, things were OK for several months and then early February, all of a sudden after a regular apt-get dis-upgrade, Shorewall raised it's head.
I know our provider had installed Fail2ban. I don't know what the difference is with that and Shorewall, and as soon as I can, I'll be looking at that as well.