Filipp, I have just tried all possibilities with the command, default instance DB host name , IP, named instance ip/named instance
nxdbmgr check
I get the same exact error as you can notice for the 4 tests
NetXMS Database Manager Version 3.9.298 Build 3.9-298-g2adbdd51e5 (UNICODE)
Unable to connect to database NetXMS@SQL2K12\SC2K12 as netxms ([Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified)
C:\NetXMS\bin>nxdbmgr check
NetXMS Database Manager Version 3.9.298 Build 3.9-298-g2adbdd51e5 (UNICODE)
Unable to connect to database NetXMS@SQL2K12 as netxms ([Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified)
C:\NetXMS\bin>nxdbmgr check
NetXMS Database Manager Version 3.9.298 Build 3.9-298-g2adbdd51e5 (UNICODE)
Unable to connect to database [email protected]\SC2K12 as netxms ([Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified)
C:\NetXMS\bin>nxdbmgr check
NetXMS Database Manager Version 3.9.298 Build 3.9-298-g2adbdd51e5 (UNICODE)
Unable to connect to database [email protected] as netxms ([Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified)
And here you can see that pining the sql server works fine
Pinging sql2k12.salam.net [192.168.1.69] with 32 bytes of data:
Reply from 192.168.1.69: bytes=32 time<1ms TTL=128
Reply from 192.168.1.69: bytes=32 time<1ms TTL=128
Reply from 192.168.1.69: bytes=32 time=1ms TTL=128
Reply from 192.168.1.69: bytes=32 time=1ms TTL=128
Ping statistics for 192.168.1.69:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 1ms, Average = 0ms