Check if port is open
 

Ok i can check connection with PING command. How can i check if remote machine allow me to connect with certain port? because i can ping it but couldn't connect.

What service are you trying to connect to?
Options include
nmap, to see which ports are open
telnet to port of your choice to see what response you get

if neither of the above succeed, check the target system is actually running the service (maybe restart it), then temporarily drop the firewall, maybe that's the issue.