> Date: Monday, August 27, 2018 07:42:48 -0400
> From: TE Dukes <tdu...@palmettoshopper.com>
>
>> From: CentOS [mailto:centos-boun...@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.
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