I recently stood up an EL7 box with Mailman for a few lists I run for some friends. My old install, on an EL6 system, ran with no issues for several years but I was induced to upgrade by a "hardware casualty" on the old system. I was going to have to rebuild anyway, so why not take it as an opportunity to try EL7? The build went fine and I was able to migrate the lists over with no issues, but once I got there just about everything to do with Mailman operations were painfully slow. For example, "list_lists" took 5 seconds of "real" time. I was used to it taking _much_ less as I only have about 6 lists. This affected both the command-line Mailman tools and the web interface. My first inclination was to blame Python, but other code executed just fine with it. While testing I tried an strace of list_lists and found that it was timing out on a read operation to a socket to the Avahi daemon (/var/run/avahi-daemon/socket) while trying to resolve the link-local IPv6 address. Having flashbacks to Sendmail stalling on DNS issues I decided to try fixing resolution first. As a test I put the link-local address into my /etc/hosts file with a localized name. Running list_lists then took about 0.19 seconds "real" time! The web interface also changed from painfully slow to it's previous behaviour on EL6. I imagine just turning off IPv6 would work as well, but I have an actual use case that is a lot easier with it turned on. I don't know if anybody else has seen this, but thought it might be handy for someone else. -- Jay Leafey - Memphis, TN jay.leafey at mindless.com