Unable to reach the remote host spool system

What causes this issue?

The SAP spool system cannot connect to the host spool system to which
the requests for this output device are to be sent.

System Response

Requests sent to this output device cannot be proccessed. They remain
in status <ZK>Waiting</>.

How to fix this error?

This message usually means that the host you specified under
<ZK>destination host </>(<ZK>Host spool access method</> tab) is either
down, or the transfer program SAPLPD (or LPD) is not running on the
host.

Procedure for System Administrators

Check to determine whether the destination host is on, or whether
SAPLPD (or LPD) is running.

Error message extract from SAP system. Copyright SAP SE.