Are you using UNICODE version of netxmsd (you can check by running netxmsd -v)?
NetXMS Server Version 2.1 Build 9012 (2.1-RELEASE) (UNICODE)
NXCP: 4.48.1.11 (AES-256, Blowfish-256, IDEA, 3DES, AES-128, Blowfish-128)
Built with: g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11)
Kind regards,
Thomas