to generate sshd host keys, for example in case of cloning a virtual linux instance, do the following steps:
Checkout the key file names
root@debdevt:~# grep HostKey /etc/ssh/sshd_config
# HostKeys for protocol version 2
since Windows 7 respectively Windows 2008R2 it has the ability to start a windows service with a trigger. Some Services, like dnscache, starts or stops on demand.
A customer had the problem that sometimes, after an automatic restart (on idle) of the DNS Client Service, Windows won’t register its name in DNS anymore. A manual register with
C:\> ipconfig /registerdns
was necessary each time.