I did a fresh install of otrs-5.0.9-01.noarch.rpm on a CentOS 6.7 (tried both 32 and 64 bit). After following all the steps from the user guide http://otrs.github.io/doc/manual/admin/ ... -on-centos I can't access the installer at: http://172.18.7.21/otrs/installer.pl. It sais:
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Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
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[Thu May 12 14:32:01 2016] [error] mkdir /opt/otrs/var/tmp/CacheFileStorable: Permission denied at /opt/otrs//Kernel/System/Cache/FileStorable.pm line 87\n