05-10 02:28:05|[Notify] elapsed time after turn on !! 0Day 3h:54m:34s
05-10 02:28:05|Pre Server Start
05-10 02:28:05|CVMem::AllocVMem VirtualAlloc() success, TypeSize[ 1508] PoolCnt[ 100] CommitSize[ 151552] vectorSize[1] Address Range(0x7FE80000 ~ 0x7FEA5000)
05-10 02:28:05|CVMem::AllocVMem VirtualAlloc() success, TypeSize[ 1528] PoolCnt[ 101] CommitSize[ 155648] vectorSize[1] Address Range(0x7FE50000 ~ 0x7FE76000)
05-10 02:28:05|CVMem::AllocVMem VirtualAlloc() success, TypeSize[ 1552] PoolCnt[15001] CommitSize[23281664] vectorSize[1] Address Range(0x7E810000 ~ 0x7FE44000)
05-10 02:28:05| ServerGroup: Dragon, Enable(1) MGameServerID(10061)
05-10 02:28:05| ServerGroup: Arena, Enable(0) MGameServerID(10062)
05-10 02:28:06| [Notify] CPreGlobal::OnPacketNotifyOfSPToMPWinSoc# 10000 CWinSocket::WS_CONNECTED wParam(0)
05-10 02:28:06| [Notify] CPreGlobal::InitServerSocket# Starting...
05-10 02:28:06| [Notify] CPreIOCP::IOCPInit# 10000
05-10 02:28:06| [Notify] CPreIOCP::IOCPInit# 11000 updated version files !
05-10 02:28:06| [Notify] CPreIOCP::IOCPInit# 12000 arranged version list !
05-10 02:28:23|[DB Error] fail to connect DBServer(CPreIOCP::IOCPInit_) !! 85.214.129.61,1433 atum2_db_account atum callweb
05-10 02:28:26|[Error] PreServer IOCPInit Error
05-10 02:28:27|[ERROR] CPreGlobal::OnPacketNotifyOfSPToMPWinSoc_ InitServerSocket_ error !!05-10 02:28:28| [Notify] CPreGlobal::EndServerSocket#
05-10 02:28:28|CGlobalGameServer::EndServerSocket_1
05-10 02:28:28|######################## Server IOCPClean ########################
05-10 02:28:28|[Notify] CVMem::FreeAllVMem_ TypeSize[ 1508] TotalCommitedObjCnts( 100) CurrentObjCnts( 100)
05-10 02:28:28|[Notify] CVMem::FreeAllVMem_ TypeSize[ 1528] TotalCommitedObjCnts( 101) CurrentObjCnts( 101)
05-10 02:28:28|[Notify] CVMem::FreeAllVMem_ TypeSize[ 1552] TotalCommitedObjCnts( 15001) CurrentObjCnts( 15001)
05-10 02:28:28|Pre Server End
05-10 02:28:28|CGlobalGameServer::EndServerSocket_1
As you found my posts already, I can pretty much only repeat myself.
Try connecting to the SQL Server via the SQL Server Management Studio, not the game servers, using the exact same IP, User ID and Password you've set in the config files. If that doesn't connect, there is no chance your game servers will. + SSMS' error reporting is a ton better than masang's. You prolly get some useful information out of that.
Otherwise, if you know how to, you can obviously also extend the error logging on server connection attempts. ODBC API error information can be read and parsed using SQLGetDiagRec, passing the respective connection handles.