Tried from the client to the server ://.

${cantconn.unknown?
• The host name ${_server.host} seems unknown.
  Are you sure that the server host name is correct?
  If so, the name server may have some (possibly temporary) problem... } ${cantconn.refused?

• Connection to the port on the server host is refused.
  Are you sure that the server port number is correct?
  If so, the server may be down now (temporarily)... } ${cantconn.unreach?

• The server host ${_server.host} seems unreachable from this delegate.
  There seems no (direct) IP route to reach the server... } ${cantconn.timeout?

• Connection to the server timed out.
  The server or the network route to the server may be in congestion, or they might be blocking your access... } ${cantconn.noroute?

• No route seems applicable toward ${_server.host}.
  The miss-configuration of CONNECT parameter or so of this DeleGate could cause this failure. }

The Administrator of this DeleGate -- <> -- may help you...