You can see the following errors on Artica 4.30 SP 206
“Fatal, Unable to find dates (last_dates) form access.log.xxxxx”
This issue means Artica did not recognize the log format sent and stored by the load-balancer.
It can be resolved using a special fix that you can download here:
http://articatech.net/download/wiki/4.30/ntpdate/artica-4.30.000000.tgz
It can be applied only for all versions before 4.30x Service Pack 355 using the same method to apply a Service Pack
The difference is when you will apply the Hotfix, Artica claim that the version is the same.
Did not care about the error, the HotFix will be correctly applied.