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Is there any chance to host multiple services (like a webserver, XMPP server, ssh server) behind one .onion address? Or do I have to create a single hidden service for each service/server?

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You can have multiple services on the same .onion address. You can forward each port to a different service.
For example:

HiddenServiceDir /path/to/hs/dir/
HiddenServicePort 80 127.0.0.1:80
HiddenServicePort 8000 127.0.0.1:8000
HiddenServicePort 81 192.168.0.102:80

This (in your torrc) would expose 3 services on 1 .onion address. The first 2 live on the same host as the Tor relay. The 3rd lives on another host in the local network.

See also section three of the site Configuring Hidden Services.

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  • Thanks for the answer! Are there any security issues by doing this? e.g. timing or load attacks? I will try that out. – dodo Oct 29 '14 at 17:01
  • "Are there any security issues by doing this?" <-- Not that I know of, or can imagine. – Jobiwan Oct 30 '14 at 12:34

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