> Date: Monday, August 27, 2018 07:42:48 -0400 > From: TE Dukes <tdukes at palmettoshopper.com> > >> From: CentOS [mailto:centos-bounces at centos.org] On Behalf Of >> Richard Sent: Monday, August 27, 2018 7:29 AM > >> >> Since the localhost4 approach worked, commend out the ipv6 >> localhost entries in your /etc/hosts file, then try: >> > IP6 is commented out > >> dig @localhost localhost a > > That works >> >> again. If that works try: >> >> telnet localhost 143 > > This also works >> >> once again. If those work, it would seem that your ipv6 is messed >> up and your system is trying it first and not falling back to ipv4. >> >> Regarding your nameserver list in /etc/resolv.conf. If you have a >> working 127.0.0.1 nameserver you generally don't include external >> nameservers in that list. So, if non-ipv6 things seem to work, I'd >> remove the two non-127 nameservers from that list. >> > Removed the two nameservers. Still can't access mail. Getting > connection to storage server failed on the roundcube login page. >> That you can now successfully get to "localhost" is good progress. Seems you want to stay away from ipv6 networking issues unless/until you resolve whatever that issue is. Roundcube is, potentially, a totally separate issue. I don't use it, so can only suggest minimal debugging ideas. What is the hostname that you use to get to your roundcube instance? Can you resolve that: dig <hostname> a If you get an answer, is the ipnumber correct? Note, if the hostname for your roundcube instance is one of the ipv6 entries in your /etc/hosts file, I'd remove that - and either put in an ipv4 entry or put an entry for it in your dns.