==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
======== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
======== Required information ====
- iRedMail version ( 0.9.4)
  Roundcube (1.2.0)
- Linux/BSD (Centos 7:)
- Store mail accounts in which backend (Mariadb):
- Web server (Apache )
- Manage mail accounts (iRedAdmin-Pro)
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
the issue is i can login in to roundcube,  but when i attempt to open any folder (inbox,  Draft , sent, junk etc)  nothing is displayed and i get the following error
(Server Error: STATUS: Internal error occurred. Refer to server log for more information. ). I have checked mariadb is running,   and i can access the databases, i have other system running on the server and it  uses a  different  database on the same mysql server and it is working fine. i have gone through the logs  except for the http error log i have attached everything looks fine. the only http error indicate is this

  [dbd:error] [pid 2591] (20014)Internal error: AH00629: Can't connect to mysql: Can't connect to MySQL server on '127.0.0.1' (111)
[Mon Oct 02 08:40:06.261209 2017] [dbd:error] [pid 2591] (20014)Internal error: AH00633: failed to initialise
[Mon Oct 02 08:40:06.261214 2017] [dbd:crit] [pid 2591] (20014)Internal error: AH00636: child init failed!
[Mon Oct 02 08:40:06.262279 2017] [dbd:error] [pid 2592] (20014)Internal error: AH00629: Can't connect to mysql: Can't connect to MySQL server on '127.0.0.1' (111)
[Mon Oct 02 08:40:06.262334 2017] [dbd:error] [pid 2592] (20014)Internal error: AH00633: failed to initialise
[Mon Oct 02 08:40:06.262340 2017] [dbd:crit] [pid 2592] (20014)Internal error: AH00636: child init failed!
[Mon Oct 02 10:09:44.100253 2017] [mpm_prefork:notice] [pid 1747] AH00170: caught SIGWINCH, shutting down gracefully

anyone with an idea or who have accoutered a similar issue?