Open SSH:

Host jupiter
HostName jupiter.par.tuwien.ac.at
Port 22
User YOURACCOUNTNAME
IdentityFile ~/.ssh/id_rsa
ProxyCommand ssh -p 1022 -i ~/.ssh/id_rsa -q -W %h:%p %r@venus.par.tuwien.ac.at

Putty:

1) Session -> set HostName & Port

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2) SSH -> Auth -> set privateKey file

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3) Connection -> Data -> set username

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4) Connection -> Proxy -> set Proxy Hostname & Proxy Port & Proxy Username
5) Connection -> Proxy ->Proxy type : Local
6)Connection -> Proxy -> local proxy command:
plink.exe -P %proxyport -i privatKey.ppk -batch -nc %host:%port %user@%proxyhost
change privatKey.ppk to your key path

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7) Open ;)