[Koha] Proxy Error after MariaDB upgrade to 10.2.14

[JanM]

Hello everyone,

i just ran into a Problem with my Koha System. After upgrading the MariaDB
from 10.0 to 10.2.14 I have no access to the Server. I can not provide the
Version of Koha, but for Apache:

#######################################################

Server version: Apache/2.4.18 (Ubuntu)
Server built:   2018-04-18T14:53:04

? apache2.service - LSB: Apache2 web server
   Loaded: loaded (/etc/init.d/apache2; bad; vendor preset: enabled)
  Drop-In: /lib/systemd/system/apache2.service.d
           +-apache2-systemd.conf
   Active: active (running) since Fri 2018-05-11 00:05:38 CEST; 5 days ago
     Docs: man:systemd-sysv-generator(8)
  Process: 62250 ExecReload=/etc/init.d/apache2 reload (code=exited,
status=0/SU
   CGroup: /system.slice/apache2.service
           +-47224 /usr/sbin/apache2 -k start
           +-48517 /usr/sbin/apache2 -k start
           +-48520 /usr/sbin/apache2 -k start
           +-61991 /usr/sbin/apache2 -k start
           +-61996 /usr/sbin/apache2 -k start
           +-62305 /usr/sbin/apache2 -k start
           +-62307 /usr/sbin/apache2 -k start
           +-62310 /usr/sbin/apache2 -k start
           +-62312 /usr/sbin/apache2 -k start
           +-62313 /usr/sbin/apache2 -k start

May 16 09:00:18 www2 systemd[1]: Reloading LSB: Apache2 web server.
May 16 09:00:18 www2 apache2[62250]:  * Reloading Apache httpd web server
apache
May 16 09:00:19 www2 apache2[62250]:  *
May 16 09:00:19 www2 systemd[1]: Reloaded LSB: Apache2 web server.

#######################################################

Memcached und Plack is active.

user at www2:~$ sudo koha-plack --start library
 * Error: Plack already running for library                             
[fail]

#######################################################

If I try to access the Website it takes about 10 Minutes until this
error-page appears:

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /index.html.

Reason: Error reading from remote server

Apache/2.4.18 (Ubuntu) Server at www2.testothek.uni-hamburg.de Port 443

Maybe someone can help me out here.

Thanks
Jan 



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