Throw Unknown if connection times out

modules/exploits/linux/http/hp_system_management.rb

@@ -71,7 +71,10 @@ class Metasploit3 < Msf::Exploit::Remote
       'uri' => "/cpqlogin.htm"
     })
 
-    if res and res.code == 200 and res.body =~ /"HP System Management Homepage v(.*)"/
+    if res.nil?
+      vprint_error("Connection timed out")
+      return Exploit::CheckCode::Unknown
+    elsif res.code == 200 and res.body =~ /"HP System Management Homepage v(.*)"/
       version = $1
       return Exploit::CheckCode::Appears if version <= "7.1.1.1"
     end