Connection closed by foreign host.

HI,

I need advise for case telnet connection from RHELL to Windows server. below the detail from this case:
telnet 192.168.11.138 1433
Trying 192.168.11.138...
Connected to 192.168.11.138.
Escape character is '^]'.
Connection closed by foreign host

The firewall from linux server to SQL Server port (1433) already allowed, and the ping connection from linux to windows server already successfully.

Thank You