Metasploit error Openssl

anyone can help me solve the problem from metasploit fail openssl
[-] Exploit failed [unreachable]: OpenSSL::SSL::SSLError SSL_connect returned=1 errno=0 state=error: dh key too small

This need verry vast information .
Suppose host is unreachable
Port is closed
firewall
Back connect ip wrong ,
Your listen port not setups

So Try following

change port