890
edits
==== Firewall ====
Between my homemachine or an outside visitor and the targetserver is the firewall, built into my router. So I have to allow port sharing of my target server. Debian's default for ssh is port 22. (For further serving http, https and parsoid and mathoid extensions I also allowed ports 80, 443, 8143 and 10043 each for IPv4 and IPv6 to be shared.)
==== Debian on targetserver ====
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