Thanks for your help.
Apache Version = 2.4.23
Again after disable and enable the external folder in the desktop synch client and than "force synchronise " nextcloud started to synchronize.
Here some logs
15-04-17 20:45:06, nextcloud/zonstr1q_phpbb3.sql.gz, Nextcloud, Gedownload, 20 MB
And
#=#=#=# Syncrun finished 2017-04-15T20:43:47 (last step: 138 msec, total: 957 msec)
#=#=#=# Syncrun started 2017-04-15T20:43:51
#=#=#=#=# Propagation starts 2017-04-15T20:43:52 (last step: 495 msec, total: 495 msec)
#=#=#=# Syncrun finished 2017-04-15T20:43:52 (last step: 117 msec, total: 612 msec)
#=#=#=# Syncrun started 2017-04-15T20:44:07
#=#=#=#=# Propagation starts 2017-04-15T20:44:09 (last step: 1452 msec, total: 1452 msec)
18:44:44||nextcloud/zonstr1q_phpbb3.sql.gz|INST_SYNC|Down|1492223408|fc5ee6e808aa8a224431ec3d7e7d8d88|20961648|00003921ocvkfsqpcxd7|4||0|20869943|1491618608|||INST_NONE|
#=#=#=# Syncrun finished 2017-04-15T20:45:07 (last step: 57941 msec, total: 59392 msec)
#=#=#=# Syncrun started 2017-04-15T20:46:01
#=#=#=#=# Propagation starts 2017-04-15T20:46:02 (last step: 1140 msec, total: 1140 msec)
#=#=#=# Syncrun finished 2017-04-15T20:46:02 (last step: 115 msec, total: 1256 msec)
And the last 3 on the server
{âreqIdâ:âjU6LeSWn43vNrIaAn3dQâ,âremoteAddrâ:â83.46.18.86â,âappâ:âupdaterâ,âmessageâ:"\OC\Updater::maintenanceDisabled: Turned off maintenance mode",âlevelâ:1,âtimeâ:â2017-03-29T18:49:40+00:00â,âmethodâ:âGETâ,âurlâ:"/nextcloud/core/ajax/update.php?requesttoken=XC3%2BdoBEI1bmHHCDXlzXvPO%2BAWQR3CYnfQKSVskr6bA%3D%3AMW%2FKIfkqUjOLdzTmDhSh5LbcLlBihH93BXOqNPFnxoE%3D",âuserâ:"â",âversionâ:â11.0.2.7â}
{âreqIdâ:âjU6LeSWn43vNrIaAn3dQâ,âremoteAddrâ:â83.46.18.86â,âappâ:âupdaterâ,âmessageâ:"\OC\Updater::resetLogLevel: Reset log level to Warning(2)",âlevelâ:1,âtimeâ:â2017-03-29T18:49:40+00:00â,âmethodâ:âGETâ,âurlâ:"/nextcloud/core/ajax/update.php?requesttoken=XC3%2BdoBEI1bmHHCDXlzXvPO%2BAWQR3CYnfQKSVskr6bA%3D%3AMW%2FKIfkqUjOLdzTmDhSh5LbcLlBihH93BXOqNPFnxoE%3D",âuserâ:"â",âversionâ:â11.0.2.7â}
{âreqIdâ:âvRcw6Dul4Ple4eEqANM2â,âremoteAddrâ:â83.41.137.17â,âappâ:âPHPâ,âmessageâ:âDoctrine\DBAL\Exception\DriverException: An exception occurred while executing âUPDATE oc_appconfig
SET configvalue
= ? WHERE (appid
= ?) AND (configkey
= ?) AND (configvalue
<> ?)â with params [â[]", âcoreâ, âlastupdateResultâ, â[]â]:\n\nSQLSTATE[HY000]: General error: 2006 MySQL server has gone away at /home/zonstr1q/public_html/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php#116",âlevelâ:3,âtimeâ:â2017-04-06T19:26:07+00:00â,âmethodâ:âGETâ,âurlâ:"/nextcloud/ocs/v2.php/apps/notifications/api/v1/notifications?format=json",âuserâ:âadminâ,âversionâ:â11.0.2.7â}
If you want more info just ask.