Gracefully shutdown

Hi, We experienced a sudden shutdown of Evostream last night. A quick look in the log file revealed the following:

1448500008:4:/thelib/include/netio/epoll/tcpconnector.h:71:OnEvent:***CONNECT ERROR: Unable to connect to: 50.112.250.6:443
1448500064:0:/common/src/utils/misc/uri.cpp:354:FromString:Unable to resolve host: evo-09.evostream.com
1448500064:0:/thelib/src/protocols/variant/basevariantappprotocolhandler.cpp:238:GetScaffold:Invalid url: https://evo-09.evostream.com/lm.php
1448500088:2:/crtmpserver/src/crtmpserver.cpp:593:QuitSignalHandler:Gracefully shutdown

Server version: 1.6.6.3491-x86_64-Ubuntu_14.04 How can we prevent in the future the server from going down automatically? Thanks Best regards Silvan