Starting Nmap 7.60 ( https://nmap.org ) at 2017-08-16 20:04 BST
Nmap scan report for server_name (server_addr)
Host is up.

PORT   STATE    SERVICE
22/tcp filtered ssh

Nmap done: 1 IP address (1 host up) scanned in 2.04 seconds

OpenSSH_7.4p1, LibreSSL 2.5.0   OR   OpenSSH_7.5p1, OpenSSL 1.0.2l  25 May 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug2: resolving "server_name" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to server_name [server_addr] port 22.
debug1: connect to address server_addr port 22: Operation timed out
ssh: connect to host server_name port 22: Operation timed out