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How to determine the port allocated on the server for a dynamically bound openssh reverse tunnel?

Fresh7 days ago
Mar 15, 20264382 views
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Problem

When creating reverse tunnels on recent versions of OpenSSH, a remote port of 0 can be given to bind any available port: ... If the port argument is `0', the listen port will be dynamically allocated on the server and reported to the client at run time. … Source: OpenSSH client manpage My question …

Error Output

# netstat -ntlp

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1 Fix

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Fix for: How to determine the port allocated on the server for a dynamically bound openssh reverse tunnel?

Low Risk

If you set the 'LogLevel' in the sshd_config configuration file to DEBUG1 (or any DEBUG level), then sshd will log the port numbers in /var/log/auth.log. Do remember, that using a LogLevel of DEBUG or higher could be a privacy risk, since much is lo…

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