Good idea, in the log I see this:
search - WARNING - could not connect to server at ‘default:’, retrying in 5 sec
And init.d/kopano-search status says
feb. 21 09:22:29 mail kopano-search[504]: [error ] gsoap connect: ()
feb. 21 09:22:29 mail kopano-search[504]: [error ] virtual HRESULT M4LMsgServiceAdmin::ConfigureMsgService(const MAPIUID*, ULONG_PTR, ULONG, ULONG, const SPropValue*): MSGSer…r (80040115)