Since some versions the error-decription on closed port is wrong when using domains to connect (with a non-standard port - if it matters).

$ ssh -p 1337 a.b.c.net
ssh: connect to host a.b.c.net port 1337: Network is unreachable

$ nslookup dag.wk.freifunk.net
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	a.b.c.net
Address: 123.123.123.123

$ ssh -p 1337 123.123.123.123 
ssh: connect to host 123.123.123.123 port 1337: Connection refused

Version:
OpenSSH_6.6.1p1, OpenSSL 1.0.1h 5 Jun 2014
System:
Arch Linux
Version: Rolling release state today 2:00 AM CEST

Expected behavoir is connecting via domain and ip does produce the same errormessage: "Connection refused" because the port is closed.