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The server can be debugged by using either the
-d option launches the server to one-shot mode.
In this mode, the server accepts only one connection and exits after the
session is disconnected. The server does not spawn a separate task for the
-D option launches the server to continuous debug
mode.In this mode, the server keeps on listening to the TCP port and accepts
several connections. The server spawns new task for each new connection and
needs to be stopped manually when you want to finish the
The debug level is either a number, or a comma-separated list of
assignments of the format
"*=7,sshd2=2". Debug level 4 is usually
sufficient. For more detailed information, debug level 7 can be